Answer:
the answer is the letter a) -sin x
Step-by-step explanation:
Simplify the expression.
sine of x to the second power minus one divided by cosine of negative x
(1−sin2(x))/(sin(x)−csc(x))
sin2x+cos2x=11−sin2x=cos2x
cos2(x)/(sin(x)−csc(x))csc(x)=1/sin(x)cos2(x)/(sin(x)− 1/sin(x))= cos2(x)/((sin2(x)− 1)/sin(x))sin2(x)− 1=-cos2(x)cos2(x)/(( -cos2(x))/sin(x))
=-sin(x)
Answer:
[tex]-cos \ x[/tex]
Step-by-step explanation:
First of all, we must have to understand what is the described expression in the paragraph
"sine of x to the second power minus one divided by cosine of negative x"
In this sentence, we need to identify what are the elements and operations involved in the expression.
In the sentence appears ""to the second power", "minus" and "divided by" (highlighted)
"sine of x to the second power minus one divided by cosine of negative x"
Therefore, the expression must has three operations:
"to the second power": refers to exponentiation"minus": refers to a substraction"divided by": refers to a divisionNow, we can identify what are the elements: "sine of x", "one" and "cosine of negative x"
"sine of x": refers to [tex]sin\ x[/tex]"one": refers to the number one (1)"cosine of negative x": refers to [tex]cos (-x)[/tex]Therefore, the expression is:
[tex]\frac{(sin\ x)^{2}-1}{cos(-x)}[/tex]
In order to find the simplified expression, we must have to apply these trigonometric identities:
[tex](sin\ x)^{2} = sin^{2}x[/tex][tex]sen\x^{2}x \ +\ cos\x^{2}x=1[/tex][tex]cos(-x)=cos\ x[/tex]Applying the first and third identities, we have:
[tex]\frac{(sin\ x)^{2}-1}{cos(-x)}=\frac{sin\x^{2}x-1}{cos\ x}[/tex]
From the second trigonometric identity, we have:
[tex]cos\x^{2}x=\ 1-sin\x^{2}x[/tex]
Now, multiplying by -1 in both sides:
[tex](-1)(cos\x^{2}x)=(-1)(1-\ sin\x^{2}x)[/tex]
In the left side, multiplying by -1 the sign of the expression changes:
[tex](-1)(cos\x^{2}x)=-cos\x^{2}x[/tex]
In the right side, multiplying by -1 changes the order of the substraction:
[tex](-1)(1-\ sin\x^{2}x)=\ sin\x^{2}x-1[/tex]
Putting all together:
[tex]-cos\x^{2}x=\ sin\x^{2}x-1[/tex]
Now, replacing values we have:
[tex]\frac{sin\x^{2}x-1}{cos\ x}=\frac{-cos\x^{2}x}{cos\ x}=-\frac{cos\x^{2}x}{cos\ x}[/tex]
Finally, the property of the first trigonometric identity (property of exponentiation) can be apply in this case:
[tex]-\frac{cos\x^{2}x}{cos\ x}=-\frac{(cos\ x)^{2}}{cos\ x}=-cos\ x[/tex]
Please help me please
Answer:
b = 17
Step-by-step explanation:
Since PQ = RQ then ΔPQR is isosceles and QS is a perpendicular bisector
Hence PS = RS = 17 ⇒ b = 17
The average age three people running for election is 42. A fourth person joins the race and the average drops to 40. What is the fourth person's age?
Let [tex]a_1,\ldots,a_4[/tex] denote the ages of the 4 candidates. Then
[tex]\dfrac{a_1+a_2+a_3+a_4}4=40[/tex]
[tex]a_1+a_2+a_3+a_4=160[/tex]
[tex]\dfrac{a_1+a_2+a_3}3+\dfrac{a_4}3=\dfrac{160}3[/tex]
The average age of the first 3 candidates is 42, so
[tex]\dfrac{a_4}3=\dfrac{160}3-42[/tex]
[tex]\implies\boxed{a_4=160-3\cdot42=34}[/tex]
PLEASE HELP ASAP
30 PTS + BRAINLIEST TO RIGHT/BEST ANSWER
Answer:
d. 3x³ and 2x³
Step-by-step explanation:
In standard form, the terms of a polynomial expression are written in order of descending powers of the variable. There will be only one term for any given power of the variable.
Here, there are two terms that have x to the third power. These terms must be combined to write the expression in standard form. They are the only terms that can be combined: 3x³ + 2x³ = 5x³.
In the figure, AB ||CD and m3=130. What is
m<6 = 180° - m<3
m<6 = 180° - 130°
m<6 = 50°
Answer: m6 equals 50 degrees
Step-by-step explanation: Since AB and CD are parallel u just solve for m2 which is the same as m6 which would be 180-130=50
PLEASE HELP ASAP 45 PTS + BRAINLIEST TO RIGHT/BEST ANSWER
The answer is C. I have the work for it in the image bellow
Hope this helped!
~Just a girl in love with Shawn Mendes
Identify the volume and surface area of the sphere in terms of π. HELP PLEASE!!
Answer:
the third one.
Answer: C) V = 562.5π [tex]in^{3}[/tex] ; S = 225π [tex]in^{2}[/tex]
Step-by-step explanation: Please see the image below!
Graph the system of equations on graph paper to answer the question.
{y=14x+3
{y=2x+10
What is the solution for this system of equations?
Answer:
(x, y) = (7/12, 11 1/6)
Step-by-step explanation:
A graph will show you the solution is near (x, y) ≈ (0.6, 11.2). For an exact answer, an algebraic solution is indicated.
Subtracting the second equation from the first gives ...
0 = 12x -7
7/12 = x
Substituting for x in the second equation gives ...
y = 2(7/12) +10 = 7/6 +10
y = 11 1/6
Mary Beth and her family ate a meal in a restaurant the cost of the meal was $34.50 the sales tax was 8% of the cost of the meal
Which choice is equivalent to the fraction below when x is greater than or equal to 2?
Answer:
D. 2(√{x} + √{x - 2})
Step-by-step explanation:
As hinted in the question, we have to simplify the denominator.
To understand it easier, let's imagine we have x - y in the denominator. If we multiply it with x + y we'll get x² - y², right? Check the next line:
(x - y) (x + y) = x² + xy -xy - y² = x² - y²
If we have the square of those nasty square roots, it will be much simpler to deal with. So, let's multiply the initial fraction using x+y, but with the real values:
[tex]\frac{4}{\sqrt{x} - \sqrt{x - 2} } * \frac{\sqrt{x} + \sqrt{x - 2}}{\sqrt{x} - \sqrt{x - 2}} = \frac{4(\sqrt{x} + \sqrt{x - 2})}{(\sqrt{x} )^{2} - (\sqrt{x - 2} )^{2} }[/tex]
Then we simplify:
[tex]\frac{4(\sqrt{x} + \sqrt{x - 2})}{(\sqrt{x} )^{2} - (\sqrt{x - 2} )^{2} } = \frac{4(\sqrt{x} + \sqrt{x - 2})}{(x) - (x - 2) } = \frac{4(\sqrt{x} + \sqrt{x - 2})}{ 2 } = 2(\sqrt{x} + \sqrt{x - 2})[/tex]
Answer is D. 2(√{x} + √{x - 2})
A student rolls a number cube Whose six faces are numbered 1 through 6 what is the sample space for this experiment.
Answer:
It depends on how you define an outcome.
Usually, the outcomes are considered to be the number showing on the top face of the die (number cube) when it comes to rest on a horizontal surface. If that is how you define outcomes, then the sample space is the set of numbers 1–6: {1, 2, 3, 4, 5, 6}.
Step-by-step explanation:
"This experiment" covers a lot of territory. The student could be checking to see if the die stays on the table or falls to the floor. The student could be experimenting to see if the die changes color or makes a certain kind of noise. The experiment could involve the number of times the die rolls over to a new face before it comes to rest. Until the experiment is properly defined, the sample space is unknown.
If the experiment is to see what number shows on the top face of the die at rest on a horizontal surface, then the sample space is presumably the set of numbers 1 through 6.
The radius of a sphere is 6 inches. Find the length of a chord connecting two perpendicular radii.
Answer:
6√2.
Step-by-step explanation:
The two radii are equal length and form a right angle, so the resulting triangle is 45-45-90. Therefore, the length of the chord (the hypotenuse of the triangle) is 6√2.
A survey of patients at a hospital classified the patients by gender and blood type, as seen in the two-way table. Gender Blood Type Male Female TOTAL A 105 93 198 B 99 84 183 O 160 140 300 AB 15 18 33 TOTAL 379 335 714 What percent of all patients are blood type AB? Round your answer to the nearest tenth of a percent. Type a numerical answer in the space provided. Do not include % or spaces in your answer.
Answer:
4.6
Step-by-step explanation:
We are given the results of a survey of patients at a hospital of their blood type, categorized by their gender.
We are to find the percentage of patients with blood type AB among all patients.
Number of patients with blood type AB = 33
Total number of patients = 714
Percent of patients with blood type AB = [tex] \frac { 3 3 } { 7 1 4 } \times 100 [/tex] = 4.6
If a right circular cone is intersected by a plane that goes through both napped of the cone but not through the vertex, as in the picture below, what shape is produced?
Answer:
F. Hyperbola
Step-by-step explanation:
In each napped, you'll have a parabola, combined they form an hyperbola.
It's one of the various shapes that can be produced by a plane intercepting a right circular cone, as you can see in the attached picture.
Each plane intersection is different, based on the angle and the position it passes through.
I hope that helps.
Answer:
hyperbola
Step-by-step explanation:
apeex
A totem pole casts a 20 meter shadow when the angle of elevation of the sum is 45what is the distance from the top of the totem pole to the end of the shadow
Answer:
20√2 meters (approximately 28.28 m)
Step-by-step explanation:
It may help to make a diagram. Because this is a 45 45 90 triangle, you can use those rules to help solve.
Final answer:
The distance from the top of a totem pole to the end of its shadow, when the angle of elevation of the sun is 45 degrees, is approximately 28.28 meters.
Explanation:
The student has presented a problem that involves using trigonometry to calculate the distance from the top of a totem pole to the end of its shadow when the angle of elevation of the sun is 45 degrees. To solve this, we can use the concept of right-angled triangles and the properties of special triangles, specifically a 45-45-90 triangle where the two legs are congruent. Since the angle of elevation is 45 degrees and the length of the shadow is given as 20 meters, we know that in this special right triangle, the lengths of the two legs are equal. Therefore, the distance from the top of the totem pole to the end of the shadow (the hypotenuse of the triangle) is the length of the shadow times the square root of 2, based on the Pythagorean theorem.
Using the formula hypotenuse = leg × √2, we substitute the leg length of 20 meters to get hypotenuse = 20 m × √2, which equals approximately 28.28 meters.
Write an explicit rule and recursive rule for a geometric sequence with a second term of 6 and a third term of 12.
Step-by-step answer:
Given:
Geometric sequence with
second term, T2 = 6
third term, T3 = 12
Wants to have the explicit and recursive rules.
Solution:
common ratio, r = 12/6 = 2
Therefore the first term, T1
= second term /r
= 6/2
=3
Thus the absolute rule is
Tn = T1 *r^(n-1) where T1 = 3, r=2. Check: T3 = T1*2^(3-1) = 3*2^2=12 ...good
The recursive rule (depending on the previous term)
Tn = Tn-1*r = 2*Tn-1
The explicit rule for the sequence is a_n = 3 * 2^(n-1), and the recursive rule is a_n = a_(n-1) * 2. These were determined by identifying the common ratio of the sequence as 2.
Explanation:In a geometric sequence, each term is generated by multiplying the previous term by a common ratio. Given the second term (6) and third term (12) in the sequence, we can identify the common ratio by dividing the third term by the second term. So, 12 divided by 6 equals 2. Therefore, the common ratio is 2.
So, the explicit rule (the nth term) of this sequence would be: a_n = a_1 * r^(n-1) = 6 / 2 * 2^(n-1) = 3 * 2^(n-1).
The recursive rule for the sequence would be: a_n = a_(n-1) * r = a_(n-1) * 2.
To summarize, we determined the common ratio to be 2 by dividing the third term by the second term. We then used this ratio to create the explicit and recursive rules for the geometric sequence.
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NEED MATH HELP!!!!
( with the 2 problems I missed)
Answer:
[tex]t=7.4years[/tex]
Step-by-step explanation:
Let's clear t from the equation [tex]N=16.10^{0.15t}[/tex]. In order to clear t, we have to apply [tex]log_{10} (x)[/tex] in both side of the equations.
[tex]log_{10}N=log_{10}(16.10)^{0.15t}[/tex]
By using properties of the logarithm
[tex]log_{10} (a.b)}= log_{10}a+log_{10}b[/tex]
We obtain:
[tex]log_{10}N=log_{10}(16)+log_{10} (10^{0.15t})[/tex]
Ordering using the logarithm property [tex]log_{10}a^{n} =nlog_{10}a[/tex] and [tex]log_{10} 10=1[/tex]
[tex]log_{10}N=log_{10}(16)+0.15tlog_{10}10[/tex]
[tex]log_{10}N=log_{10}(16)+0.15t[/tex]
Clearing t
[tex]t=\frac{log_{10}N-log_{10}(16)}{0.15}[/tex] using the logarith property [tex]log_{10}a-log_{10}b=log_{10}\frac{a}{b}[/tex]
we obtain:
[tex]t=\frac{log_{10}\frac{N}{16} }{0.15}[/tex]
The number of Elm trees is N = 204
Solving
[tex]t=\frac{log_{10}\frac{204}{16} }{0.15}\\t=\frac{log_{10}12.75}{0.15}=7.370[/tex]
Round to the nearest tenths place [tex]t=7.4years[/tex]
The hypotenuse of a 45°-45°-90° triangle measures 128 cm. What is the length of one leg of the triangle?
Answer:
90.51 (rounded to the nearest hundredth)
Step-by-step explanation:
We can use trigonometry to figure this out
sin = opposite side / hypothenuse
The 45° angle's opposite side is a leg of the triangle
sin 45 = leg / 128
sin 45 * 128 = (leg / 128 ) * 128
0.7071 * 128 = leg
90.51 = leg
Answer:
b
Step-by-step explanation:
Phillip has a box of crayons. 45 are yellow, 12 are green, 25 are blue, and 7 are red. If Phillip selects a crayon at random, which color crayon would he be MOST likely to select? Why?
Answer:
yellow b/c there are the most
Step-by-step explanation:
Which explanation best describes how to solve this problem? Marcia covered her kitchen floor with twice as much tile as her bathroom floor. She tiled 15 square feet of her bathroom floor. She also tiled a 9-square-foot area by her front door. How many square feet of her house did Marcia tile altogether?
Answer:
54 ft^2
Step-by-step explanation:
Bathroom area is 15 ft^2
The kitchen is twice the bathroom
2*15 = 30 ft^2
Kitchen: 30 ft^2
Front door: 9ft^2
The total is all the areas added together
Total = bathroom + kitchen + front door
= 15 ft^2 + 30 ft^2 + 9 ft^2
= 54 ft^2
Fred's dog groomer charges $25 to give his dog a haircut. The groomer is increasing the price for a haircut by 35%. What will Fred pay the groomer the next time his dog has a haircut?
Answer:
33.75
Step-by-step explanation:
Step 1- Find the decimal form of 35%
Step 2- When you find that multiply that by 25
Step 3- When you find the answer to step 2 add that to 25
That is your answer
Final answer:
The price that Fred will pay the groomer the next time when his dog has a haircut is $33.75.
Explanation:
The question asks us to calculate the new price Fred will pay for his dog's haircut after the groomer increases the price by 35%. To find the new price, we'll use the formula for calculating percentage increase, which is: New Price = Original Price + (Original Price * Percentage Increase).
First, convert the percentage increase to a decimal by dividing it by 100, so 35% becomes 0.35. Then, multiply the original price of $25 by 0.35 to find the amount of the increase, which is $8.75.Finally, add the increase to the original price to find the new price, which is $25 + $8.75 = $33.75. So, Fred will pay $33.75 the next time his dog has a haircut.
Use the domain and range of each of the following relations to determine which is a function.
Answer:
a) Function
b) Not a function
c) Function
d) Not a function
Step-by-step explanation:
a) Domain = { 7,-6,2}
Range = {5,0,3}
It is a function as every value in domain has some and unique value mapped to it in Range
b)
Domain = { 7,-6,2}
Range = {5,0,-2,3}
It is not a function as -6 value in domain has two values mapped to it in Range
c)
Domain = { 7,2}
Range = {-6,-7}
It is a function as every value in domain has some and unique value mapped to it in Range
d)
Domain = { 7,-6}
Range = {5,0,3}
It is not a function as 7 value in domain has two values 3 and 5 mapped to it in Range
please help me figure out the radius
Answer:
Step-by-step explanation:
<EAF is a central angle. Its measure is 12o
Arc EF has angular measure of 12 degrees as well.
The formula for the arc length in cm is
Arc length = (given arc angle/360) * 2 * pi * r
r = 30 cm which is given
Given arc angle = 12 degrees.
Arc length = (12/360) * 2* pi * r
Arc length = 1/30 * 2*pi * 30
Arc length = 6.28
Which expression represents the area of the triangle drawn below (4x-3) (2x-1) (4x-2) (3x-3)?
Answer:
option C
Step-by-step explanation:
Area of the triangle=4x²+4x+1
Mr. McGregor has discovered that a large dog can destroy his entire garden in 2 hours and that a small boy can do the same job in 1 hour. How long would it take the large dog and the small boy working together to destroy Mr McGregor's garden?
The large dog and small boy working together will take 2/3 hour to destroy Mr McGregor's garden.
Explanation:To solve this problem, we can add the rates at which the large dog and the small boy work together:
Large dog's rate = 1 garden / 2 hours = 1/2 garden per hour
Small boy's rate = 1 garden / 1 hour = 1 garden per hour
Combined rate = 1/2 garden per hour + 1 garden per hour = 3/2 gardens per hour
Now, we can use the combined rate to find the time it would take for the large dog and the small boy to destroy Mr. McGregor's garden:
Time = 1 garden / Combined rate = 1 garden / (3/2 gardens per hour) = 2/3 hour
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Simplify 3ab + 4ab + 5
12ab
7ab + 5
not possible
Answer:
7ab+5
Step-by-step explanation:
add like terms (3ab+4ab=7ab)
5 doesn't have a like term so it stays by itself
Hey there! :)
3ab + 4ab + 5
In order to simplify this, we must add like terms. In addition, when simplifying, you can ONLY add like terms.
Since both "3ab" & "4ab" contain "ab," you are able to combine them together!
When combining like terms, you only add the numerical value, not the letters.
This leaves us with : 7ab + 5
Therefore, your answer is 7ab + 5
~Hope I helped!~
The scores of a psychology exam were normally distributed with a mean of 70 and a standard deviation of 5 a failing grade on the exam was anything two or more standard deviations below the mean what was the cutoff for a failing score
Answer:
The Answer is likely 60.
Step-by-step explanation:
Two standard deviations from 70 is 60, because the actual deviation is 5, so 2 of those equals 10. 10 - 70 = 60.
Answer:
60
Step-by-step explanation:
Two standard deviations below the mean is:
70 - 2(5) = 60
Three friends buy one pack of 80 stickers. T hey divide the stickers equally and give the remainder to their teacher. How many will each friend get?
Answer:
26
Step-by-step explanation:
80 divided by three = 26.666666
26 times 3 = 78
2 leftover
The number sticker each student get is 26 and the number stickers teacher got is 2.
What is the division?The division is one of the basic arithmetic operations in math in which a larger number is broken down into smaller groups having the same number of items.
Given that, three friends buy one pack of 80 stickers.
Now, number of stickers each friend = 80/3
3|80|26
78
_____
2
Therefore, the number sticker each student get is 26 and the number stickers teacher got is 2.
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Jackie contributed a batch of baklava to the school bazaar. There are 12 pieces in a batch, and each piece sells for $1.50. If all the baklava is sold, what will Jackie's total contribution to the school be?
Answer:
Jackie's total contribution the school would be $18.00
Step-by-step explanation:
Jackie's contribution to the school bazaar = a batch of baklava
No. of pieces in a batch = 12 pieces
Price of one piece = $1.50
CASE: All baklava is sold
No. of pieces of Baklava sold = 12 pieces
Price of 12 pieces of Baklava = no. of pieces * Price of one piece
= 12 * $1.50
= $18.00
What is the solution to the equation below?
Please show work.
Answer:
x = -9
Step-by-step explanation:
Multiply both sides by √(x - 6) to eliminate the fraction:
√(3x) = 3√(x - 6)
Now square both sides:
3x = 9(x - 6), or 3x = 9x - 54.
Combining the x terms results in -6x = -54, and thus x = 9.
Answer:
The correct answer is option D. x = 9
Step-by-step explanation:
From the attached question we get an expression,
√3x/√(x - 6) = 3
To find the solution of given expression
√3x/√(x - 6) = 3
Squaring both side we get,
3x/(x - 6) = 9
3x = 9 * (x - 6)
3x = 9x - 54
9x - 3x = 54
6x = 54
x = 54/6 = 9
Therefore the correct option is D. x = 9
Someone, please help. Will Mark brainlist if the answer is correct.
Screenshot it below.
[tex]\bf \textit{equation of a circle}\\\\ (x- h)^2+(y- k)^2= r^2 \qquad center~~(\stackrel{}{ h},\stackrel{}{ k})\qquad \qquad radius=\stackrel{}{ r} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ (x-9)^2+y^2=4\implies (x-\stackrel{h}{9})^2+(y-\stackrel{k}{0})^2=2^2~\hfill \stackrel{center}{(9,0)} \\\\\\ (x-\stackrel{h}{3})^2+(y-\stackrel{k}{2})^2=4\implies (x-\stackrel{h}{3})^2+(y-\stackrel{k}{2})^2=2^2~\hfill \stackrel{center}{(3,2)}[/tex]
Check the picture below.
well, its radius didn't change, anyhow, you know what to check out.
Answer:
The circle moves left and up
Step-by-step explanation:
The circle's center changes from (9, 0) to (3,2) and the radius stayed the same.