Two boats on opposite banks of a river start moving towards each other. They first pass each other 1400 meters from one bank. They each continue to the opposite bank, immediately turn around and start back to the other bank. When they pass each other a second time, they are 600 meters from the other bank. We assume that each boat travels at a constant speed all along the journey. Find the width of the river?
S1 = speed of boat 1
t1 = time to do 1400 meters (boat 1)
S1*t1 = 1400
S2 = speed of boat 2
1400 + S2*t1 = X
t2 = time to do X + 600 (boat 2)
S1*t2 = X + 600
S2*t2 = 2X - 600
S1 = 1400/t1
S2 = (X-1400)/t1
T = t2/t1
1400*T = X + 600
X*T - 1400*T = 2X - 600
X = 3600 meters
River is 3600 meters wide
if r is five less than three times L, then r=
Answer: r=L-3
Step-by-step explanation:
Of a group of 500 people, 60 are fit enough to climb Mount Shasta in California. The group has 300 women and 200 men. 12% of the men are fit to climb the mountain. What is the probability that a person picked at random from the group is a male or is fit to climb Mount Shasta?
The probability that a person picked at random from the group is a male or is fit to climb Mount Shasta is 47.2%.
What is probability?Probability is defined as the ratio of the number of favourable outcomes to the total number of outcomes in other words the probability is the number that shows the happening of the event.
Probability = Number of favourable outcomes / Number of sample
Take 12 of 200 to determine the number of fit men,
Fit men = 12% × 200
Fit men = 0.12 × 200
Fit men = 24
Since they are asking males and the number of people fits enough, you must subtract the fit men from the fit people so you are not doubling the men
60 - 24 = 36
Add the fit people to the male group,
36+200 = 236
The probability will be calculated as,
P = 236/500
P = 118/250
P = 59/125
P = 47.2%
The probability is 47.5%.
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What is the density of a 7000 gram brick that is 4 inches x 5 inches x 3 inches?
Andrew has 48 country CDs and 72 rock CDs. He wants to arrange them on shelves so that the two types of CDs are separate, but he wants the largest number of CDs on a shelf as possible. How many CDs should he put on each shelf?
How can I combine like terms ?
Step-by-step explanation: To understand how to combine like terms, let's look at an example.
9c + 2c
The two parts of this expression, +9c and +2c, are called terms. The numbers in front of the variables, +9 and +2, are called coefficients.
Since the variables, c and c, are identical, the two terms in this problem are called like terms.
Like terms can be added together by simply adding their coefficients.
So in this problem, since 9 + 2 = 11, 9c + 2c is simply 11c.
Suppose △ABC≅△EFG. Which congruency statement is true? AB¯¯¯¯¯≅FG¯¯¯¯¯ BC¯¯¯¯¯≅FG¯¯¯¯¯ AC¯¯¯¯¯≅EF¯¯¯¯¯ AB¯¯¯¯¯≅EG¯¯¯¯¯
A = E
B = F
C = G
Look for the equation which has the same placement. Your answer should be B) BC=FG
Answer: Second option [tex]BC\cong FG[/tex] is the correct option.
Explanation:
If two triangles are congruent then their corresponding sides are congruent.
In [tex]\triangle ABC[/tex] and [tex]\triangle EFG[/tex], AB, BC, and CA are corresponding to EF, FG and GE respectively.
Therefore, if [tex]\triangle ABC\cong \triangle EFG[/tex] then,
[tex]AB\cong EF[/tex],
[tex]BC\cong FG[/tex],
And, [tex]CA\cong GE[/tex]
Therefore, only second option is correct.
what is the x an what is the slope of angle lmn
since line MO bisects, that means both angles are the same
6x-22 = 2x +34
6x = 2x +56
4x=56
x = 56/4 = 14
x=14
6(14)-22 = 62
2(14)+34 = 62
62+62 = 124
angle LMN = 124 degrees
The bases on a baseball diamond are 90 feet apart. how far is it from home plate to second base?
Find the percent of decrease. 140 to 84.
Use your calculator to find an interval of length 0.01 that contains a root. (enter your answer using interval notation.)
Find the constants m and b in the linear function f(x) = mx + b so that f(4) = 1 and the straight line represented by f has slope -14
.....Simplify (8^4)^–16.
Malcom uses a marker to draw a straight line on a piece of paper. The line is 2/3 ft long. He wants to divide the line into sections that are each 1/9 ft long. How many sections will the line be divided into? please help ill mark brainliest
Answer:
6 sections.
Step-by-step explanation:
Malcom uses a marker to draw a straight line on a piece of paper.
The line is [tex]\frac{2}{3}[/tex] feet long.
He wants to divide the line into sections of [tex]\frac{1}{9}[/tex] feet long.
The number of sections would be = [tex]\frac{\frac{2}{3}}{\frac{1}{9} }[/tex]
= [tex]\frac{2}{3}[/tex] × [tex]\frac{9}{1}[/tex]
= [tex]\frac{18}{3}[/tex]
= 6 sections
There would be 6 sections.
How do you write 11/ 4 as a percentage?
Evaluate the function for x = –4c if c = –2.
f(x) = -3^2 - 4x
A.
–160
B.
–256
C.
–224
D.
160
How do i solve the square root of 54x^9y^6?
in the problem 4 times 12 equals 48 which numbers are the factors
The frequency distribution shows the lengths, in inches, of available baseball bat at a batting cage. what is the mean of the frequency distribution? Baseball bat length| 27 28 31 33 34 F| 2 5 3 1 4
Sam is a painter. He has 2 1/4 gallons of paint, and it takes 3/4 of a gallon to paint a room. How many rooms can he paint?
A.1
B.2
C.3
D.4
Find the measure of each complementary angles with measure 4x and 5x - 18 degrees
the vertices of a parallelogram are j (-5,0) K(1,4), L(3,1) and M(-3,-3). How can you use slope to determine whether the parallelogram is a rectangle? is it a rectangle? Justify your answer.
To determine if the parallelogram is a rectangle, we can use the slopes of its sides. Given the coordinates of the vertices, we can calculate the slopes and compare them. If the opposite sides have equal slopes, then the parallelogram is a rectangle.
Explanation:To determine if the parallelogram is a rectangle, we can use the slopes of its sides. A rectangle has opposite sides that are parallel and equal in length, so the opposite sides of a rectangle will have equal slopes.
Using the given vertices, we can find the slopes for the sides:
Slope of JK = (4 - 0) / (1 - (-5)) = 4/6 = 2/3
Slope of KL = (1 - 4) / (3 - 1) = -3/2
Slope of LM = (-3 - 1) / (-3 - 3) = -4/-6 = 2/3
Slope of MJ = (0 - (-3)) / (-5 - (-3)) = 3/(-2) = -3/2
Since the opposite sides JK and LM have equal slopes of 2/3 and the opposite sides KL and MJ have equal slopes of -3/2, we can conclude that the parallelogram is a rectangle.
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1. What is the remainder when x^2+4 is divided by x-2?
2. Evaluate f(-1) using substitution: f(x)=2x^3-3x^2-18x-8
3. The point (1,0) lies on the graph of p(x)=x^4-2x^3-x+2
True or false
4. If x-1 is a factor of p(x)=x^3-7x^2+15x-9, which of the following represents the complete factorization for p(x)?
A. (x-3)(x+4)(x+1)
B. (x-3)(x-3)(x-1)
C. (x-3)(x+3)(x-1)
D. (x-3)(x+3)(x+1)
Answer:
1) 8
2) 5
3) False
4) Option B
Step-by-step explanation:
1) We have to find the remainder when we divide (x² + 4) by (x - 2)
To get the remainder we will put x = 2 in (x² + 4)
= (2)² + 4
= 8
2). We have to evaluate f(-1) using substitution in f(x) = 2x³ - 3x² - 18x - 8
f(-1) = 2(-1)³ - 3(-1)²- 18(-1) - 8
= 2(-1) - 3 + 18 -8
= -2 - 3 + 18 - 8
= 5
3) The point (1, 0) lies on the graph of p(x) = [tex]x^{4}-2x^{3}-x+2[/tex]
If this point lies on the graph then p(1) should be equal to zero.
p(1) = 1³ - 7(1)² + 7(1) - 9
= 1 - 7 + 7 - 9
= -8 ≠ 0
Therefore, It's false.
4). (x - 1) is a factor of p(x) = x³ - 7x² + 15x - 9
Now we will factorize it further when (x - 1) is a zero factor.
By Synthetic division
1 | 1 - 7 15 -9
1 -6 9
-----------------------------
1 -6 9 0
Now we have got the expression as (x - 1)(x²- 6x + 9)
Or (x -1)(x² - 6x + 9) = (x - 1)(x - 3)(x - 3)
Therefore, Option B. is the answer.
The point (4,-3) lies on the circle centre (-2,5). Find the radius of the circle
The radius of the circle with the given coordinates is 6.32 units.
What is the circle?A circle is a two-dimensional figure formed by a set of points that are at a constant or at a fixed distance (radius) from a fixed point (center) on the plane. The fixed point is called the origin or center of the circle and the fixed distance of the points from the origin is called the radius.
Given that, the point (4,-3) lies on the circle center (-2,5).
Using distance formula we can find the radius of a circle
We know that, Distance =√[(x2-x1)²+(y2-y1)²]
Now, radius =√[(-2-4)²+(5-(-3))²]
=√[(-6)²+(2)²]
= √36+4
= √40
= 6.32 units
Therefore, the radius of the circle is 6.32 units.
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A right triangle has a hypotenuse of 50 feet and a leg of 14 feet. Which is the length of the other leg? 24 feet 30 feet 42 feet 48 feet
Answer:
The length of the other leg is 48 feet
Step-by-step explanation:
To find the length of the other leg, we will simply follow the steps below;
We will use the Pythagoras theorem formula to solve;
Write down the Pythagoras theorem formula
opposite² + adjacent² = hypotenuse²
Let the value of the other leg be x
From the question given;
hypotenuse = 50, a leg, say the opposite = 14
Lets substitute into our formula;
opposite² + adjacent² = hypotenuse²
14² + x² = 50²
196 + x² = 2500
subtract 196 from both-side of the equation
196 - 196 + x² = 2500 - 196
x² = 2304
Take the square root of both-side of the equation
√x² = √2304
x = 48 feet
The length of the other leg is 48 feet
Find f(-5) if f(x) = |x + 1|.
A.4
B.5
C.6
Please help!
Which of the following functions has the greatest y-intercept?
f(x)
x y
(−3, 9)
( −2, 4)
(−1, 1)
(0,0)
( 1, 1)
(2 ,4)
g(x) = 5 cos(3x) − 5
The answer is both. Desmos graphing calculator is a great tool if you don't have a calculator on you. Hope this helps!
Solve for x.
2/5≤x−4
Solve for x. 45(15x+20)−7x=56(12x−24)+6
The value of x is 559.5.
An algebraic equation can be defined as mathematical statement in which two expressions are set equal to each other.
To solve the equation [tex]\(45(15x+20)7x=56(12x*24)+6\)[/tex], follow these steps:
First, distribute the multiplication on both sides of the equation:
[tex]\(45 \cdot 15x + 45 \cdot 20 - 7x = 56 \cdot 12x - 56 \cdot 24 + 6\)[/tex]
[tex]\(675x + 900 - 7x = 672x - 1344 + 6\)[/tex]
Next, combine like terms on both sides:
[tex]\(668x + 900 = 672x - 1338\)[/tex]
Now, move all terms involving [tex]\(x\)[/tex] to one side and constants to the other side:
[tex]\(668x - 672x = -1338 - 900\)[/tex]
[tex]\(-4x = -2238\)[/tex]
To find [tex]\(x\)[/tex], divide both sides by [tex]\(-4\)[/tex]:
[tex]\(x = \frac{-2238}{-4}\)[/tex]
[tex]\(x = 559.5\)[/tex]
So, the value of x is 559.5.
Use the chain rule to find dz/dt calculator
The chain rule allows you to find the derivative of a function that is a composition of other functions. With an example, we calculated dz/dt with z = y^3 and y = 2t+1. While calculators can help, understanding the process is key.
Explanation:The chain rule in calculus is a theorem that allows you to find the derivative of a composite function. If a variable z depends on the variable y, which itself depends on another variable t, then z, is a function of t. The chain rule could be mathematically expressed as dz/dt = (dz/dy) × (dy/dt).
For instance, if z = y^3 and y = 2t+1, we can calculate dz/dt by first finding the derivatives dz/dy and dy/dt, which are 3y² and 2, respectively. We then substitute y = 2t+1 into dz/dy to get dz/dy = 3(2t+1)². Therefore, using the chain rule, dz/dt = 3(2t+1)² × 2.
While your request mentions a calculator, knowing these steps should enable you to perform the operation using most scientific calculators. However, understanding the process is very important before relying on technology.
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The final expression for [tex]\frac{dz}{dt}[/tex] incorporates the partial derivatives and the derivatives of x and y with respect to t.
Given the function z = xy⁷ - x²y, where x = t² + 1 and y = t² - 1, we are to find [tex]\frac{dz}{dt}[/tex].
To do this, we apply the chain rule for derivatives:[tex]\frac{dz}{dt}[/tex] = ([tex]\frac{dz}{dx}[/tex]) × ([tex]\frac{dx}{dt}[/tex]) + ([tex]\frac{dz}{dy}[/tex]) × ([tex]\frac{dy}{dt}[/tex]).
First, we calculate [tex]\frac{dx}{dt}[/tex] and [tex]\frac{dy}{dt}[/tex].Then, we find the partial derivatives [tex]\frac{dz}{dx}[/tex] and [tex]\frac{dz}{dy}[/tex].Finally, we combine these results to find dz/dt using the chain rule.Let's find [tex]\frac{dx}{dt}[/tex] and [tex]\frac{dy}{dt}[/tex]:
⇒ [tex]\frac{dx}{dt}[/tex] = d(t² + 1) ÷ dt = 2t
⇒ [tex]\frac{dy}{dt}[/tex] = d(t² - 1) ÷ dt = 2t
Next, we compute the partial derivatives of z with respect to x and y:⇒ [tex]\frac{dz}{dx}[/tex] = y⁷ - 2xy
⇒ [tex]\frac{dz}{dy}[/tex] = 7xy⁶ - x²
Now, we substitute x and y into these partial derivatives:x = t² + 1, y = t² - 1
⇒ [tex]\frac{dz}{dx}[/tex] = (t² - 1)⁷ - 2(t² + 1)(t² - 1)
⇒ [tex]\frac{dz}{dy}[/tex] = 7(t² + 1)(t² - 1)⁶ - (t² + 1)²
Finally, we combine these to find [tex]\frac{dz}{dt}[/tex]:
⇒ [tex]\frac{dz}{dt}[/tex] = ([tex]\frac{dz}{dx}[/tex]) × ([tex]\frac{dx}{dt}[/tex]) + ([tex]\frac{dz}{dy}[/tex]) × ([tex]\frac{dy}{dt}[/tex]).
Substituting everything into this formula:
⇒ [tex]\frac{dz}{dt}[/tex] = [(t² - 1)⁷ - 2(t² + 1)(t² - 1)] × 2t + [7(t² + 1)(t² - 1)⁶ - (t² + 1)²] × 2t
Complete question:
Use the Chain Rule to find [tex]\frac{dz}{dt}[/tex].
z = xy⁷ - x²y, x= t² + 1, y = t² - 1