The shape and bond angle of oxy-nitrogen ions is determined by the number of bonds and lone pairs around the central atom, with examples being trigonal pyramidal for nitrogen with three bonds and one lone pair, tetrahedral for carbon with four bonds, and bent for oxygen with two bonds and two lone pairs.
The oxynitrogen ions have specific shapes and bond angles that correlate with their electron-pair geometries. For example, a nitrogen atom with three bonds and one lone pair will have a trigonal pyramidal shape with bond angles close to 109°. Carbon atoms in different environments also exhibit varied shapes: a carbon atom in CH₂ with four bonds and no lone pairs has a tetrahedral shape with bond angles of 109.5°, while a carbon atom in CO₂ with two double bonds (treated as equivalent to three bonds) and no lone pairs forms a trigonal planar shape.
An oxygen atom in OH with two bonds and two lone pairs has a bent or angular shape with bond angles close to 109°. It's essential to note that electron pair repulsion and hybridization of orbitals play a crucial role in determining these geometric shapes and the bond angles.
Based on the options provided and the common shapes of oxynitrogen ions, the correct answer would be:
- Trigonal planar, 120°
- Tetrahedral, 109.5°
- Bent, 120°
- Pyramidal, 109°
These shapes and bond angles are commonly observed in oxynitrogen ions depending on the arrangement of atoms and lone pairs around the central nitrogen atom.
The shape and bond angle of oxynitrogen ions depend on the arrangement of atoms and lone pairs around the central nitrogen atom. Let's go through each option:
1. Linear, 180°: This shape occurs when there are no lone pairs on the central nitrogen atom, and there are two bonded atoms around it. The bond angle is indeed 180°.
2. Trigonal planar, 120°: This shape occurs when there is one lone pair and three bonded atoms around the central nitrogen atom. The bond angle is indeed 120°.
3. Tetrahedral, 109.5°: This shape occurs when there are four bonded atoms around the central nitrogen atom and no lone pairs. The bond angle is indeed 109.5°.
4. Bent, 120°: This shape occurs when there is one lone pair and two bonded atoms around the central nitrogen atom. The bond angle is close to 120° but may deviate slightly due to lone pair-bond pair repulsions.
5. Bent, 109°: This shape is less common for oxynitrogen ions but can occur if there is a lone pair and two bonded atoms around the central nitrogen atom. The bond angle would be closer to 109° due to lone pair-bond pair repulsions.
6. Pyramidal, 109°: This shape occurs when there is one lone pair and three bonded atoms around the central nitrogen atom. The bond angle is indeed close to 109°.
Based on the options provided and the common shapes of oxynitrogen ions, the correct answer would be:
- Trigonal planar, 120°
- Tetrahedral, 109.5°
- Bent, 120°
- Pyramidal, 109°
These shapes and bond angles are commonly observed in oxynitrogen ions depending on the arrangement of atoms and lone pairs around the central nitrogen atom.
The sum of the first 100 positive integers is 5,050. What is the sum of the first 200 positive integers?
A. 10,000B. 10,200C. 15,050D. 20,050E. 20,100
The sum of the k for k=1 to k="n"=(n*(n+1))/2 , where "n" is the total integer.
In this problem n = 200
Sum = (200*201)/2 = 20,100
Stephen recently purchased a camper. The value of the camper after t years is given by the following expression.
22,475(0.81)^t
Which of the following best describes the expression?
A.
the product of the initial value of the camper and its decay factor raised to the number of months since it was purchased
B.
the product of the initial value of the camper and its growth factor raised to the number of years since it was purchased
C.
the product of the initial value of the camper and its decay factor raised to the number of years since it was purchased
D.
the product of the initial value of the camper and its growth factor raised to the number of months since it was purchased
Answer:
C
Step-by-step explanation:
since the camper gets old we will choose decay factor over the years and since t is in years in the explanation so t in the expression means years as well
The expression describes the initial value of the camper multiplied by its annual decay factor raised to the power of the number of years since purchase, corresponding to option C.
The expression 22,475(0.81)^t best describes the product of the initial value of the camper and its decay factor raised to the number of years since it was purchased. The correct choice that describes the expression is C. The initial value of the camper is given as $22,475. The factor 0.81 represents the annual depreciation rate, meaning that the camper loses 19% of its value each year (100% - 81% = 19% decay). The variable t stands for the number of years since the purchase. Therefore, each year, the value is multiplied by 0.81, repeatedly, to reflect the continuous decrease in value.
A farmer needs to ship 71 pumpkins to a grocery store if each crates can hold 19 pumpkins how many crates Will the farmer need ? Write an expression you could use to determine how many crates you would need
Answer:
The farmer will need 7 crates.
Step-by-step explanation:
It is given that there are 71 pumpkins in total.
And each crate holds 19 pumpkins.
Let the number of crates required be "n".
The total number of pumpkins can be calculated by multiplying number of pumpkins in each crate with total number of crates.
Thus, the equation is
[tex]19(n) = 71[/tex]
[tex]n = \frac{71}{19} = 7[/tex]
Thus, the farmer needs 7 crates to hold total of 71 pumpkins.
If each light fixture on a job requires 4 lamps and each room requires 16 fixtures, how many lamps will be required for 6 rooms?
Answer:
384 lamps
Step-by-step explanation:
This is simply a multiplication problem. From the question, we know that each fixture needs 4 lamps with a single room needing 16 fixtures.
The number of lamps required by each room is thus 16 * 4 = 64 lamps
Now, the total number of lamps required by 6 rooms is thus 64 * 6 = 384 lamps
To find the total number of lamps required for 6 rooms, multiply the number of fixtures per room by the number of rooms, then multiply the result by the number of lamps per fixture.
Explanation:To find the total number of lamps required for 6 rooms, we need to first determine the number of fixtures in 6 rooms. Since each room requires 16 fixtures, the total number of fixtures in 6 rooms would be 16 x 6 = 96 fixtures.
Each fixture requires 4 lamps, so to find the total number of lamps required for 96 fixtures, we multiply 96 x 4 = 384 lamps.
Therefore, 384 lamps will be required for 6 rooms.
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When interest rates being paid on new bonds are higher but the interest payments on an existing bond remain fixed, the only way for the existing bond to compete is for its price to go _______________..
Answer: The bond has to go down.
Step-by-step explanation: A bond is a loan usually given by an issuer to an investor that pays back a fixed rate of return.
Although bonds have a fixed rate of return, bonds itself are not fixed which means when bond price can rise or fall. When bond rises, interest falls and when bond price falls, interest rises. A vice versa relationship.
What this means is that the investor has to pay more, take for example.
-If a bond of $100 has a return rate of 10%, this means investor will pay back $10.
-If bond price increases $120, investor will have to pay $12. Investor pays more
-However, if bond price decreases to $80, investor will pay $8. Investor pays less
Therefore, for an existing bond to compete with a new bond which has a higher interest rate, the existing bond price has to go down so that interest can go up.
Tickets for a raffle costs $7. There were 640 tickets sold. One ticket will be randomly selected as the winner, and that person wins $ 1600 and also the person is given back the cost of the ticket. For someone who buys a ticket, what is the Expected Value (the mean of the distribution)?
Answer: Expected value is -4.48.
Step-by-step explanation:
Since we have given that
Cost of ticket for a raffle = $7
Number of tickets sold = 640
Amount winner wins = $1600
So, we need to find the expected value.
So, it becomes,
[tex]E[x]=\sum xp(x)\\E[x]=-7\times \dfrac{639}{640}+(1600+7)\times \dfrac{1}{640}\\\\E[x]=\dfrac{-4473+1607}{640}\\\\E[x]=\dfrac{-2866}{640}\\\\E[x]=-4.48[/tex]
Hence, Expected value is -4.48.
Need this please help
Answer:
Step-by-step explanation:
a) Steps to prove that two triangles are similar are
1) AA(angle angle)if two angles of each triangle is congruent to two angles of another triangle, then the third angles of both triangles must be congruent since the sum of angles in the triangle is 180 degrees
2) SSS(side side side) if the three sides of both triangles are proportional to each other, then the triangles are similar.
3) SAS(side angle side) if two sides of a triangle are proportional to two sides of another triangle and and the angle formed by both lines in the two triangles are equal, then the third sides of both triangles are proportional. Therefore, the triangles are similar.
b) triangle ABC would be similar to triangle QRS if
1) angle A is congruent to angle Q and angle B is congruent to angle R
2)if the ratio of AB to QR is proportional to the ratio of AC to QS, and to BC to RS
3) if AC is proportional to QS, AB is proportional to QR and angle A = angle Q
c) AC/AB = QS/QR
60/50 = 6/QR
6/5 = 6/QR
6QR = 6×5 = 30
QR = 30/6 = 5 cm
If you write all the whole numbers from 1 to 500 in a row, what will be the 500th digit?
a. 0 or 1b. 2 or 3c. 4 or 5d. 6 or 7e. 8 or 9
The 500th digit from 1 to 500 in a row will be;
A: 0 or 1
We want to write all the whole numbers from 1 to 500 in a row. The single digit numbers are; 1 to 9 = 9 numbers = 9 digitsThe double digit numbers are; 10 to 99 = 90 numbers × 2 = 180 digits
This is a total of 180 + 9 = 189 digits
We want to find the 500th digit.Thus, after 99, we are looking for the;
500 - 189 digit = 311th digit
311 is not divisible by 3 and so the nearest term that is divisible by 3 is 312. Thus;(100 + x)3 = 312
100 + x = 312/3
100 + x = 104
x = 104 - 100
x = 4
Thus, the 104th term after 99 would contain the 500th digit.The 104th term after 99 is;
104 + 99 = 203
Since we used the 312th instead of 311th, it means that 0 is the 311th term.Read more on sequence at; https://brainly.com/question/7882626
As per the question, the 500th digit would be:
a). 0 or 1
To write,
Numbers from [tex]1 to 500[/tex]
The numbers containing 1 digit [tex]= 9[/tex] digits (1 to 9)
The numbers containing 2 digits [tex]= 90[/tex] × [tex]2 = 180[/tex] (from 10 to 99)
To find,
[tex]500th[/tex] digit
Remaining [tex]= 500 - (180 + 9)[/tex]
[tex]= 311th[/tex]
As we know, 311 can not be divided by 3, and therefore, we will look for the nearest number that is divisible by 3 i.e. 312
So, assuming the x as 100 + nth digit
[tex](100 + x)3 = 312[/tex]
[tex]100 + x = 312/3[/tex]
[tex]100 + x = 104[/tex]
[tex]x = 104 - 100[/tex]
∵[tex]x = 4[/tex]
Now,
[tex]100 + 4 = 104th digit[/tex]
∵ [tex]104 + 99 = 203[/tex]
Since the [tex]312th[/tex] term is employed rather than the [tex]311th[/tex], it implies that[tex]203 - 3 = 200[/tex]. Thus, 0 would be the [tex]500th[/tex] digit.
Thus, option a is the correct answer.
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What is the effect on the graph of the parent function f(x) = x when f(x) is replaced with f(x) - 4? A) shifts the line 4 units up B) shifts the line 4 units down C) increases the slope of the line by a factor of 4 D) decreases the slope of the line by a factor of 4
Answer:
B) shifts the line 4 units down
Step-by-step explanation:
The point (x, f(x)) is moved to the point (x, f(x)-4), one with a y-coordinate 4 units lower. The line is shifted down 4 units.
Answer:
B) shifts the line 4 units down.
Step-by-step explanation:
The constant negative number makes a vertical translation of the parent function in the -y direction. Slope keeps intact. So, the right answer is B.
The number of math problems solved in a class, ????, varies directly with the length of time x and inversely with the number of student questions in that time y. If in 6 minutes of class there were 14 student questions and a total of 5 problems that were solved, then write ???? as a function of x and y. ???? = x/y function equation editor
The function that represents the number of math problems solved in a class is given by ????(x, y) = (15/7)* x / y, where x represents time and y represents the number of student questions. The constant of variation 'k' is 15/7.
Explanation:Given that the number of math problems solved (????) in class is influenced by time duration (x) and the number of student questions (y), we can infer a relationship. We can define a constant of variation (k), which stands for the number of problems solved per time unit and per question. Based on the provided situation where 5 problems were solved in 6 minutes with 14 questions, we calculate k as k = ????(x/y) = 5(6/14) = 30/14 = 15/7.
Therefore, the function that represents this scenario is ????(x, y) = (15/7)* x / y, where x is the length of time and y is the number of student questions.
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Kobe attends barber school so far he has completed 612 hours if Kobe attended School the same number of hours each day for a total of 68 days how many hours did he attend school each day?
Answer:
Kobe attended barber school for 9 hours each day.
Step-by-step explanation:
Total number of hours completed by Kobe in barber school = 612 hours
Total number of days Kobe attended the school for = 68 days
We are given that Kobe attended school for same number of hours each day.
So, in order to find the number of hours Kobe attended each day we will use unitary method.
In 68 days Kobe completed = 612 hours of school
So, in 1 day he will complete = [tex]\frac{612}{68}=9[/tex] hours
Thus, Kobe attended barber school for 9 hours each day.
the russian ice breaker Yamal can move forward through 2.3 meter 2.3 meter thick ice at a speed 5.5 kilometers 5.5 kilometers per hour . hour . Write and solve a multiplication equation to find the number of hours hours it takes to travel 82 kilometers 82 kilometers through ice Evaluate
Answer:
Yamal can move the ice to 82 km in approximately 15 hrs.
Step-by-step explanation:
Given:
Speed = 5.5 km/hr
Distance = 82 km
Let time be represented as 'x'.
We need to find the number of hours required to travel 82 km.
We know that Distance can be calculated by the product of Speed and time.
Framing above sentence in equation form we get;
Distance = Speed × Time
Substituting the given value we get;
[tex]82 = 5.5x[/tex]
Hence The expression for number of hours is [tex]82 = 5.5x[/tex]
Solving the equation to find the value of x we get;
[tex]82 = 5.5x\\\\x=\frac{82}{5.5} = 14.90 \approx 15\ hrs[/tex]
Hence Yamal can move the ice to 82 km in approximately 15 hrs.
The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118.
What is the first quartile?
a. 100.8
b. 119.8
c. 128.8
d. 112
e. 122.5
Answer: d. 112
Step-by-step explanation:
First Quartile is the median of the first half of ordered data (from smallest to largest).
The given data : 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118.
Arrange in Ascending order , we get
45,99, 108,116,118, 118, 118, 119,120, 121,124,130, 148
First half = 45,99, 108,116,118, 118
No. of elements = 6
First Quartile = Median of first half = Mean of middlemost terms
=[tex]\dfrac{108+116}{2}=\dfrac{224}{2}=112[/tex]
Hence, the First quartile = 112
Correct answer = d. 112
Select the correct answer from each drop-down menu.
Maggie is monitoring the number of fish in a fish breeding center. The table below shows the number of fish with respect to the number of months elapsed.
Number of Months 0 1 2 3 4
Number of Fish 1,024 1,280 1,600 2,000 2,500
The independent variable in the relationship is the_____________ and should be placed on the______________ .
The dependent variable in the relationship is the_____________ and should be placed on the__________________ .
Answer:
The independent variable in the relationship is the Number of Months and should be placed on the x-axis .
The dependent variable in the relationship is the Number of Fish and should be placed on the y-axis .
Step-by-step explanation:
Independent variable is the variable that is being changed or controlled. It's the value that you would graph on the x-axis. Intuitively you would graph the months on the x-axis. I don't really know how to explain it other than that.
Dependent variable is the variable that is being measured. It's the value that is being graphed on the y-axis. You're measuring the amount of fish so that's your dependent variable.
A car rental costs $70 per day plus an additional $0.50 for each mile driven. The daily cost y is given by the equation y = 0.50x + 70
Answer:
Cannot give answer until Mile (x) is given
Step-by-step explanation:
The Morrison’s car uses one gallon of gasoline for every 28 miles. If gasoline costs $1.50 per gallon, how many miles can they drive if they spend $24 on gasoline?
Given:
$ 1.50 / gallon
1 gallon = 28 miles;
Solution:
$ 24.00 / $ 1.50 = 16 gallons
16 gallons x 28 miles = 448 miles
have a nice day:)
Answer:they would drive 448 miles if they spend $24 on gasoline
Step-by-step explanation:
The Morrison’s car uses one gallon of gasoline for every 28 miles. If gasoline costs $1.50 per gallon, then the cost of driving 28 miles would be $1.5.
Therefore, the number of miles can they drive if they spend $24 on gasoline would be
(28 × 24)/1.5 = 448 miles
In 2000, the population of Israel was approximately 6.27 million and by 2040 it is projected to grow to 9 million. Use the exponential growth model:A=A_o.e^(kt)in which t is the number of years after 2000, to find an exponential growth function that models the data.
The exponential growth function that models the data is: A(t) = 6.27 million * e^(0.0173t)
We can use the given information to solve for the parameters in the exponential growth model:
1. Set up the equation:
We know the initial population (A_0) is 6.27 million and the projected population after 40 years (t = 40) is 9 million. Therefore:
A(t) = 6.27 million * e^(kt)
2. Solve for k:
Substitute the final population value and time into the equation and solve for k:
9 million = 6.27 million * e^(40k)
e^(40k) = 9 million / 6.27 million
e^(40k) ≈ 1.433
Take the natural logarithm of both sides to isolate k:
40k ≈ ln(1.433)
k ≈ ln(1.433) / 40
k ≈ 0.0173
3. Write the complete function:
Now that we know k, we can substitute it back into the original equation to find the complete function:
A(t) = 6.27 million * e^(0.0173t)
Therefore, the exponential growth function that models the data is: A(t) = 6.27 million * e^(0.0173t)
If a fair coin is tossed three times, find the probability of getting heads on the first toss and tails on the second and third tosses.
Answer:
The answer is: [tex]\frac{1}{8}[/tex]
Step-by-step explanation:
The sample space when tossing a coin three times is [HHH, HHT, HTH, HTT, THH, THT, TTH, TTT] and the total number of occurrence is 8.
Getting Head on first toss, tail on second and third is: HTT and it occurs just once in our sample space.
Therefore, the probability of getting Head on first toss, tails on second and third tosses is: [tex]\frac{1}{8}[/tex]
Note probability = [tex]\frac{number of possible occurrence}{number of total occurrence}[/tex]
Line segment AB is dilated to create line segment A'B' using point Q as the center of dilation. Point Q is the center of dilation. Line segment A B is dilated to create line segment A prime B prime. The length of Q A is 1.25 and the length of A A prime is 1.25. What is the scale factor?
Answer:
2
Step-by-step explanation:
A is on the line QA', which is 1.25+1.25 = 2.50 units long*. Thus the scale factor is ...
QA'/QA = 2.50/1.25 = 2
The scale factor is 2.
_____
* There are two points on the line QA that are 1.25 units from A. One of them is point Q. If A' is coincident with Q, then the scale factor is 0, and line segment A'B' is the single point Q. We don't believe that is intended to be the case, so we assume that point A' is farther along AQ, hence 2.5 units from Q.
A contractor is considering a project that promises a profit of $46,000 with a probability of 0.7, or a loss (due to bad weather, strikes, and such) of $12,000 with a probability of 0.3.
If many projects have these same probabilities and costs, how much should the contractor expect to earn on average per contract?
Answer:
$28,600
Step-by-step explanation:
Probably of 0.7 = 46000
Probability of 0.3 = 12000
The average profit = Sum of (x*Pr(x)
=0.7(46000) + 0.3(-12000)
= 32200 - 3600
= $28,600
The contractor should expect to earn $28,600 on the average
Given points A (1, 2/3), B (x, -4/5), and C (-1/2, 4) determine the value of x such that all three points are collinear
Answer:
Step-by-step explanation:
Let B divides AB in the ratio K:1
[tex]x=\frac{nx1+mx2}{m+n} \\y=\frac{ny1+my2}{m+n} \\\frac{-4}{5} =\frac{1*\frac{2}{3}+k*4}{k+1} \\-4k-4=\frac{10}{3} +20k\\-12 k-12=10+60k\\72k=-22\\36k=-11\\k=-\frac{11}{36} \\[/tex]
so B divides AB in the ratio 11:-36
[tex]x=\frac{-36*1+11 *\frac{-1}{2} }{11-36} \\x=\frac{83}{50}[/tex]
Answer:
[tex]\large \boxed{1.66}[/tex]
Step-by-step explanation:
1. Calculate the equation of the straight line joining A and C.
The equation for a straight line is
y = mx + b
where m is the slope of the line and b is the y-intercept.
The line passes through the points (-½, 4) and (1, ⅔)
(a) Calculate the slope of the line
[tex]\begin{array}{rcl}m & = & \dfrac{y_{2} - y_{1}}{x_{2} - x_{1}}\\\\ & = & \dfrac{\frac{2}{3} - 4}{1 - (-\frac{1}{2})}\\\\& = & \dfrac{-\frac{10}{3}}{\frac{3}{2}}\\\\& = & \dfrac{-10}{3}\times{\dfrac{2}{3}}\\\\& = & \dfrac{-20}{9}\\\\\end{array}[/tex]
(b) Find the y-intercept
Insert the coordinates of one of the points into the equation
[tex]\begin{array}{rcl}y & = & mx + b\\4 & = & \dfrac{-20}{9}\left(-\dfrac{1}{2}\right) + b \\\\4 & = & \dfrac{10}{9} + b\\\\b & = & \dfrac{36}{9} - \dfrac{10}{9}\\\\b & = & \dfrac{26}{9}\\\\\end{array}[/tex]
(c) Write the equation for the line
[tex]y = -\dfrac{20}{9}x + \dfrac{26}{9}[/tex]
2. Calculate the value of x when y = -⅘
[tex]\begin{array}{rcl}y & = & -\dfrac{20}{9}x + \dfrac{26}{9}\\\\-\dfrac{4}{5} & = & -\dfrac{20}{9}x+ \dfrac{26}{9}\\\\36 & = & 100x -130\\100x & = & 166\\x & = & 1.66\\\end{array}\\\text{The value of x is $\large \boxed{\mathbf{1.66}}$}[/tex]
The graph below shows your three collinear points.
After sales tax your brand new car is $17,300. What is the total price of the car with DMV fees of 1.25% of the purchase price of the car?
A. $261.25
B. $17,516.25
C. $216.25
D. $17,561.25
The right answer is Option B.
Step-by-step explanation:
Given,
Purchase price of car with sales tax = $17300
DMV fees = 1.25%
Amount of DMV fees = 1.25% of purchase price
Amount of DMV fees = [tex]\frac{1.25}{100}*17300=\frac{21625}{100}[/tex]
Amount of DMV fees = $216.25
Total price = Purchase price + DMV fees
Total price = 17300 + 216.25
Total price = $17516.25
The total price of car with DMV fees is $17,516.25
The right answer is Option B.
Keywords: percentage, addition
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Final answer:
The total price of the car including DMV fees of 1.25% is (B) $17,516.25, which is found by adding the DMV fees of $216.25 to the purchase price of $17,300.
Explanation:
The question asks for the total price of a car including DMV fees, which are 1.25% of the purchase price of the car after sales tax.
To find the DMV fees, first convert the percentage to a decimal by dividing 1.25 by 100, which gives us 0.0125. Then multiply the purchase price after sales tax, $17,300, by 0.0125 to get the DMV fees.
The calculation is: $17,300 x 0.0125 = $216.25.
Finally, add the DMV fees to the purchase price to get the total price: $17,300 + $216.25 = $17,516.25. Therefore, the correct answer is B. $17,516.25.
Ayanna jumps rope 32 times every minute. What is the algebraic equation to express the function of the total number of times Ayanna jumped rope? A. 32 = j - m B. j = 32m C. m = 32j D. m + j =32
Answer:
B) [tex]j=32m[/tex]
Step-by-step explanation:
Given:
Ayanna jumps at the rate of = 32 times/minute
To find the algebraic equation to express the function of the total number of time Ayanna jumped the rope.
Solution:
Let [tex]j[/tex] represent the total jumps made by Ayanna.
Let Ayanna jump for [tex]m[/tex] minutes.
Using unitary method to calculate total number of jumps made by Ayanna in [tex]m[/tex] minutes.
In 1 minute, Ayanna jumps = 32 times
Thus, in [tex]m[/tex] minutes Ayanna will jump = [tex]32\times m=32m[/tex] times
Thus, the function can be represented as;
[tex]j=32m[/tex] (Answer)
Answer: b
Step-by-step explanation:
A number has three digits the tens digit is five When the hundreds digit and the ones digit Are switched the number increases by 495 what is the number
There are 4 numbers possible 156, 257, 358 and 459.
What is place value?The value a digit in a number represents based on where it is in the number is known as place value.
Let 25 is a number, then the place value of 2 is 20.
Let the three-digit number is x5y,
Then the number whose digits are switched is y5x,
The number x5y can be written according to its place value = 100x + 50 + y
Similarly, y5x can be written according to its place value = 100 y + 50 + x
The number y5x is 495 more than the number x5y
Implies that,
100 y + 50 + x - (100x + 50 + y) = 495
99y-99x - 495
99(y-x) = 495
y-x = 5
The numbers can be 156, 257, 358 and 459.
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Final answer:
To find the three-digit number with the tens digit being 5 and the number increasing by 495 when the hundreds and ones digits are switched, set up an equation using placeholders for the hundreds and ones digits, solve the equation to find these digits, and deduce the original number, which is 459.
Explanation:
The question involves finding a three-digit number based on given conditions about digits and their positions. We know that the tens digit is 5. If we switch the hundreds and the ones digits, the number increases by 495. This implies that the ones digit must be less than the hundreds digit, as switching them results in a larger number. Let's denote the hundreds digit by 'a' and the ones digit by 'c'.
The original number can be represented as 100a + 50 + c, and after switching, the number becomes 100c + 50 + a. The problem states that the latter is 495 units larger than the original number. So, we can set up the following equation:
100c + 50 + a = (100a + 50 + c) + 495
Simplifying the equation gives us:
99c - 99a = 495
This simplifies to:
c - a = 5
Since 'a' and 'c' are digits, the only possibility is that a = 4 and c = 9. Therefore, the original number is 459.
ind the probability of answering the two multiple choice questions correctly if random guesses are made. Assume the questions each have five choices for the answer. Only one of the choices is correct.a. 0.04 b. 0.4 c. 0.02 d. 0.004
Answer: a. 0.04
Step-by-step explanation:
Given : Number of multiple choice questions = 2
Choices given in each question = 5
Since only one choice is correct out of 5.
So, the probability of selecting the correct answer = [tex]\dfrac{1}{5}[/tex]
Also, both questions are independent of each other.
It means , The probability of answering the two multiple choice questions correctly if random guesses are made
=( Probability of selecting the correct answer in question 1 ) x ( Probability of selecting the correct answer in question 2 )
= [tex]\dfrac{1}{5}\times\dfrac{1}{5}= 0.04[/tex]
Hence, the required probability =0.04
A system of inequalities is shown. Which symbol could be written in both circles in order to represent this system algebraically? y 3x x –2 ≤ ≥ < >
Answer:
"≥"
Step-by-step explanation:
1) Well, for the sake of clarity we'll use a circle on a number line to represent the point solution of each inequality.
2) Writing the system:
[tex]\left\{\begin{matrix}y\geqslant 3x&\\x\geqslant-2&\end{matrix}\right.[/tex]
3) We'll shade the circles and use "≥"
Final answer:
The correct inequality symbols that could be written in both circles for the system 'y 3x x –2' are '<=' and '>=', representing the relationships 'y <= 3x' and 'x >= -2' respectively.
Explanation:
To represent the given system of inequalities algebraically, one needs to identify the correct inequality symbols that could be used between the variables x and y. These symbols articulate the ordering and relationship between these variables.
Given the statement of the system 'y 3x x –2', the inequality symbols that could fit in the circles to complete the system algebraically could be '<=' for 'y <= 3x' and '>=' for 'x >= -2'. This means '<=' and '>=' are both inequality symbols that could be written in the circles to represent the relationship between the variables according to the rules of inequalities which define x is less than or equal to y (x <= y), and x is greater than or equal to y (x >= y).
Inequalities allow us to compare relative sizes or orders of numbers and to solve various algebraic problems dealing with quantity and relationships.
Describe where the function has a vertical asymptote and EXPLAIN how you found your answer.
[tex]f(x) \frac{x^2 +7x+10}{x^2+9x+20}[/tex]
Answer:
x = -4
Step-by-step explanation:
Vertical asymptotes are found where the denominator has a zero that is not cancelled by a numerator zero. Here, the expression simplifies to ...
[tex]f(x)=\dfrac{x^2+7x+10}{x^2+9x+20}=\dfrac{(x+5)(x+2)}{(x+5)(x+4)}=\dfrac{x+2}{x+4} \qquad x\ne -5[/tex]
The function is undefined at x=-5, but has a vertical asymptote at x=-4.
The average life of Canadian women is 73.75 years, and the standard deviation of the life expectancy of Canadian women is 6.5 years. Based on Chebyshev's theorem, determine the upper and lower bounds on the average life expectancy of Canadian women such that at least 90 percent of the population is included. a. 53.20; 94.30b. 66.38, 81.13 c. 67.25, 80.25 d. 12.09, 135.41
Answer:
a. 53.20; 94.30
Step-by-step explanation:
Data given
[tex]\mu =73.75[/tex] reprsent the population mean
[tex]\sigma=6.5[/tex] represent the population standard deviation
The Chebyshev's Theorem states that for any dataset
• We have at least 75% of all the data within two deviations from the mean.
• We have at least 88.9% of all the data within three deviations from the mean.
• We have at least 93.8% of all the data within four deviations from the mean.
Or in general words "For any set of data (either population or sample) and for any constant k greater than 1, the proportion of the data that must lie within k standard deviations on either side of the mean is at least: [tex] 1-\frac{1}{k^2}"[/tex]
We want the limits that have at least 90% of the population is include. And using the theorem we have this:
[tex]0.9 =1-\frac{1}{k^2}[/tex]
And solving for k we have this:
[tex]\frac{1}{k^2}=0.1[/tex]
[tex]k^2 =\frac{1}{0.1}=10[/tex]
[tex]k=\pm 3.162[/tex]
So then we need the limits between two deviations from the mean in order to have at least 90% of the data will reside.
Lower bound:
[tex]\mu -3.162\sigma=73.75-3.162(6.5)=53.195 \apporx 53.20[/tex]
Upper bound:
[tex]\mu +3.192\sigma=73.75+3.162(6.5)=94.304 \approx 94.30[/tex]
So the final answer would be between (53.20;94.30)
Using Chebyshev's theorem to find the range of life expectancy for Canadian women that includes at least 90% of the population, the lower and upper bounds are approximately 53.21 years and 94.29 years, respectively.
Explanation:The question pertains to calculating bounds on life expectancy using Chebyshev's theorem, which is a statistical rule that applies to different types of distributions, regardless of their shape. To calculate the bounds that include at least 90% of the data for the life expectancy of Canadian women, where the mean is 73.75 years, and the standard deviation is 6.5 years, we need to use the formula k = 1/√(1-(1/p)), where p is the proportion of the population. In this case, since we want to include at least 90% of the population, p=0.9.
First, we solve for k:
k = 1/√(1-(1/0.9))
k ≈ 3.16
Then, we multiply k by the standard deviation and subtract it from and add it to the mean to find the bounds:
Lower Bound = Mean - k * Standard Deviation
Lower Bound = 73.75 - (3.16 * 6.5) ≈ 53.21
Upper Bound = Mean + k * Standard Deviation
Upper Bound = 73.75 + (3.16 * 6.5) ≈ 94.29
Therefore, the bounds are approximately 53.21 years and 94.29 years, which corresponds to option a. 53.20; 94.30.
Tim ate four more cookies than Alice.Bob ate twice as many cookies as Tim. If x represents the number of cookies alive ate,which expression represents the number of cookies bob ate
Answer:
(x + 4) x 2
Step-by-step explanation:
x represents number of cookies Alice ate.
x + 4 represents the number of cookies Tim ate.
As Bob had eaten twice the number of cookies that Alice ate the expression should be
(x + 4) x 2
The first four stripes on a wall with 100 stripes are red , blue, white, and purple, These four colors repeat in the same order. What color is the 55th stripe ?
Answer: the 55th stripe is white
Step-by-step explanation:
The first four stripes on a wall with 100 stripes are red , blue, white, and purple. The four colors repeat in the same order. This means that Red always follow blue which is followed by white and then purple. This means that red would always start each new and consecutive set of four stripes and purple will always end it
We want to determine the 55th stripe. The last four stripes that include 55 ends with the 56th stripe. This means that the 56th stripe is purple. Therefore, the 55th stripe would be white because it follows purple.
The color of the 55th stripe on the wall is white. The colors repeat every four stripes implying that the 55th, as per our calculation, falls on the third color in the pattern, white.
Explanation:This is a repetition pattern problem in Mathematics. The pattern of colors (red, blue, white, purple) on the wall repeats every four stripes. To determine the 55th stripe color, we divide 55 by 4, getting a quotient of 13 and a remainder of 3. The remainder indicates that the 55th stripe is the third color in our repeating pattern which is white.
Learn more about Repetition pattern here:https://brainly.com/question/21270470
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