Answer:
Sure, here are the answers to your questions:
**A) The value of $f(-5)$ is $-2$.**
To find the value of $f(-5)$, we can simply substitute $x=-5$ into the equation $f(x)=-2x^2-8x+14$. This gives us:
$$f(-5)=-2(-5)^2-8(-5)+14=-2(25)+40+14=-50+54=4$$
**B) The vertex of the parabola is $(2,6)$.**
To find the vertex of the parabola, we can complete the square. This involves adding and subtracting $\left(\dfrac{{b}}{2}\right)^2$ to both sides of the equation, where $b$ is the coefficient of the $x$ term. In this case, $b=-8$, so we have:
$$\begin{aligned}f(x)&=-2x^2-8x+14\\\\ f(x)+20&=-2x^2-8x+14+20\\\\ f(x)+20&=-2(x^2+4x)\\\\ f(x)+20&=-2(x^2+4x+4)\\\\ f(x)+20&=-2(x+2)^2\end{aligned}$$
Now, if we subtract 20 from both sides, we get the equation of the parabola in vertex form:
$$f(x)=-2(x+2)^2-20$$
The vertex of a parabola in vertex form is always the point $(h,k)$, where $h$ is the coefficient of the $x$ term and $k$ is the constant term. In this case, $h=-2$ and $k=-20$, so the vertex of the parabola is $(-2,-20)$. We can also see this by graphing the parabola.
[Image of a parabola with vertex at (-2, -20)]
**C) The $y$-intercept is the point $(0,14)$.**
The $y$-intercept of a parabola is the point where the parabola crosses the $y$-axis. This happens when $x=0$, so we can simply substitute $x=0$ into the equation $f(x)=-2x^2-8x+14$ to find the $y$-intercept:
$$f(0)=-2(0)^2-8(0)+14=14$$
Therefore, the $y$-intercept is the point $(0,14)$.
**D) The two values of $x$ that make $f(x)=0$ are $2.5$ and $-3.5$.**
To find the values of $x$ that make $f(x)=0$, we can set the equation $f(x)=-2x^2-8x+14$ equal to zero and solve for $x$. This gives us:
$$-2x^2-8x+14=0$$
We can factor the left-hand side of the equation as follows:
$$-2(x-2)(x-3)=0$$
This means that either $x-2=0$ or $x-3=0$. Solving for $x$ in each case gives us the following values:
$$x=2\text{ or }x=3$$
However, we need to round our answers to two decimal places. To do this, we can use the calculator. Rounding $x=2$ and $x=3$ to two decimal places gives us the following values:
$$x=2.5\text{ and }x=-3.5$$
Therefore, the two values of $x$ that make $f(x)=0$ are $2.5$ and $-3.5$.
please help me!!!!!!
The line of reflection of the given image is:
A reflection across y = -3
What is the Line of Reflection?A line of reflection is a line that lies between two identical mirror images, so the distance of any point of one figure from the line will equal the distance of the same point of the mirror image (flipped figure).
The definition above tells us that if we are given two images, such as mirror images of each other, the line of reflection can be determined by calculating the midpoint from any two points of the figures.
Looking at the given image, the center point of the mirror images is seen as y = -3
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One notebook and 2 packs of pencils cost $7.20 two notebooks and 2 packs of paper cost $10.90.How much does 1 pack of paper cost
Answer:
5.45
Step-by-step explanation:
literally do 10.9/2
Isaac measured the time it took for some teams to complete an escape room game. He recorded their times in the table below. How many of the teams took less than 20minutes to complete the game? (Image: Image showing mathematical content for the question.)
32 is the number of teams took less than 20minutes to complete the game
Given that Isaac measured the time it took for some teams to complete an escape room game.
The times were recorded in the table
We have to find the number of teams which are less than 20minutes to complete the game
Number of teams took less than 20 minutes
=8+24
=32
Hence, 32 is the number of teams took less than 20minutes to complete the game.
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Directed line segment PQ has endpoint P (-8,-4) and Q (4,12). Determine the point that partitions the directed line segment in a ratio of 3
The directed line segment PQ is divided at this point at a 3:1 ratio (1, 8)
According to the section formula, the coordinates of a point R may be determined by dividing a line segment PQ by that point in the ratio m:n as follows:
[tex]R_x = (n * Px + m * Qx) / (m + n)\\R_y = (n * Py + m * Qy) / (m + n)[/tex]
where [tex]P_x, P_y[/tex] are the coordinates of point P, and [tex]Q_x, Q_y[/tex] are the coordinates of point Q.
In this case, we want to divide the line segment PQ in a ratio of 3:1. This means that m = 3 and n = 1.
Using the formula, we can find the coordinates of the point R that divides PQ in a 3:1 ratio:
Rx = (1 * (-8) + 3 * 4) / (3 + 1) = 1
Ry = (1 * (-4) + 3 * 12) / (3 + 1) = 8
Therefore, the point that partitions the directed line segment PQ in a ratio of 3:1 is (1, 8).
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I NEED HELP!!!! I DONT UNDERSTAND WHAT TO DO SO IF YOU COULD SOLVE IT FOR ME THAT WOULD BE GREAT!!! THXXXX
The measure of the angles are:
∠1 = 90
∠2 = 90
∠3 = 132
We have,
The angle between the tangent and the radius of a circle is 90.
So,
∠1 = 90
∠2 = 90
And,
48 + 90 + 90 + ∠3 = 360 ______(1)
Solve for ∠3 from (1).
48 + 90 + 90 + ∠3 = 360
48 + 180 + ∠3 = 360
∠3 = 360 - 228
∠3 = 132
Thus,
The measure of the angles are:
∠1 = 90
∠2 = 90
∠3 = 132
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Define your variables, write a system of equations, use your calculator to solve the system of equations and answer the problem.
A grocer sells milk chocolate at $2.60 per pound, dark chocolate at $4.80 per pound, and dark chocolate with almonds at $5.50 per pound. He wants to make a mixture of 50 pounds of mixed chocolates to sell at $4.71 per pound. The mixture is to contain as many pounds of dark chocolate with almonds as milk chocolate and dark chocolate combined. How many pounds of each type must he use in this mixture?
10 pounds of milk chocolate, 15 pounds of dark chocolate, and 25 pounds of almond chocolate.
We have,
A grocer sells milk chocolate at $2.60 per pound, dark chocolate at $4.80 per pound, and dark chocolate with almonds at $5.50 per pound.
Let x be the pounds of milk chocolate and y is the number of pounds of of dark chocolate.
So, x + y + (x+y)= 50
2(x+y)= 50
x+y = 25
x = 25 - y
Now, 2.6x + 4.8y + 5.5(x+y)= 50(4.71)
2.6x + 5.5x + 4.8y + 5.5y = 235.5
8.1x+ 10.3y = 235.5
8.1(25-y) + 10.3y = 235.5
202.5 - 8.1y + 10.3y = 235.5
2.2y = 33
y = 15
and, x = 10
Thus, 10 pounds of milk chocolate, 15 pounds of dark chocolate, and 25 pounds of almond chocolate.
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Which function has the graph shown?
A. y = secx
B. y = sinx
C. y = cotx
D. y = tanx
Answer:
tanx
Step-by-step explanation:
Need help??? With this question
Answer:
[tex]28 + y + 36 = 180[/tex]
[tex]64 + y = 180[/tex]
[tex]y = 116[/tex]
Please help with my geometry.
What is the area of the segment?
r = 3m
central angle = 98°
An element with a mass of 640 grams decays by 19.3% per minute. To the nearest
tenth of a minute, how long will it be until there are 50 grams of the element
remaining?
it will take approximately 6.8 minutes until there are 50 grams of the element remaining.
We can use exponential decay formula to solve this problem:
A = A₀ ×e²(-rt)
where A is the amount of the element remaining, A₀ is the initial amount, r is the decay rate (as a decimal), t is the time elapsed.
We know that the initial mass of the element is 640 grams, the decay rate is 19.3% per minute, and we want to find the time it takes for there to be 50 grams of the element remaining. So we can write:
50 = 640 ×e²(-0.193t)
Dividing both sides by 640, we get:
0.078125 = e²(-0.193t)
Taking the natural logarithm of both sides, we get:
ln(0.078125) = -0.193t
Solving for t, we get:
t = ln(0.078125) / (-0.193)
t ≈ 6.8 minutes
Therefore, it will take approximately 6.8 minutes until there are 50 grams of the element remaining.
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Answer:
Please mark me the brainliest
Let's denote the time in minutes by t, and the mass of the element at time t by m(t). Then we can write an exponential decay equation:
m(t) = m(0) * (1 - r)^t
where m(0) is the initial mass of the element, r is the decay rate as a decimal (19.3% = 0.193), and t is the time in minutes.
We know that the initial mass is m(0) = 640 grams, and we want to find the time t when the mass has decreased to 50 grams. So we can set up the following equation:
50 = 640 * (1 - 0.193)^t
Simplifying:
0.07796875 = 0.807^t
Taking the natural logarithm of both sides:
ln(0.07796875) = ln(0.807^t)
Using the property of logarithms that ln(a^b) = b * ln(a):
ln(0.07796875) = t * ln(0.807)
Dividing both sides by ln(0.807):
t = ln(0.07796875) / ln(0.807)
Using a calculator, we get:
t ≈ 24.9
Therefore, to the nearest tenth of a minute, it will take 24.9 minutes until there are 50 grams of the element remaining.
Step-by-step explanation:
SVM & Kernel Methods Problem 1 (10 points) In this problem we would like to compare the solutions of hard and soft SVMs on a linearly seperable dataset. Let n > 1 be a fixed number. Is it true that there exists C > 0 such that for every sample S of n training examples with binary label, which are linearly separable, the hard-SVM and the soft-SVM (with parameter C) solutions will return exactly the same weight vector. Justify your answer. (Hint: consider n = 2, d = 1 and S = {(x1, yı), (x2, y2)}. Let a > 0 and consider x1 = a, yı = 1, X2 = –a, y2 = -1. Derive the optimal solution for hard and soft SVM and compare the results.)
It is not true that there exists a C > 0 such that for every sample S of n training examples with binary label, which are linearly separable, the hard-SVM and the soft-SVM (with parameter C) solutions will return exactly the same weight vector.
This can be shown by considering the case where n = 2, d = 1 and S = {(x1, yı), (x2, y2)}. Let a > 0 and consider x1 = a, yı = 1, X2 = –a, y2 = -1.
For the hard-SVM, the optimal solution is to find the weight vector w that maximizes the margin between the two classes while ensuring that all training examples are classified correctly. In this case, the margin is 2a and the weight vector is w = (0, 1) or w = (0, -1), depending on the choice of the positive and negative class labels.
For the soft-SVM with parameter C, the optimal solution is to find the weight vector w and the slack variables ξi that minimize the objective function:
min ||w||^2 + CΣξi
s.t. yi(wT xi) ≥ 1 - ξi, ξi ≥ 0
In this case, since the data is linearly separable, the slack variables will be zero for all training examples and the optimal solution will be the same as for the hard-SVM. However, if C is chosen to be a large value, the soft-SVM may allow some misclassifications by penalizing them with the slack variables. In this case, the optimal solution will be different from the hard-SVM.
Therefore, it is not always true that the hard-SVM and soft-SVM solutions will return exactly the same weight vector for linearly separable data, but they may be the same if the parameter C is chosen appropriately.
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Whats the slope?
Y=x+5
Answer:
Step-by-step explanation:
1
Therefore, for the equation y=x+5 , the slope is 1 , and the y-intercept is 5 .
what point on number line is 7/9 the way from the point -3.6 to the point 10?
The point on the number line that is 7/9 of the way from -3.6 to 10 is approximately 6.97777777778.
To find the point on the number line that is 7/9 of the way from -3.6 to 10, we can use the following formula:
Point = Starting point + (Fraction of distance) x (Total distance)
In this case, the starting point is -3.6, the total distance is the distance from -3.6 to 10 (which is 10 - (-3.6) = 13.6), and the fraction of distance is 7/9.
Plugging in these values, we get:
Point = -3.6 + (7/9) x (13.6)
Simplifying,
Point = -3.6 + (7/9) x (13.6)
Point = -3.6 + 9.9556
Point = 6.97777777778
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Given PQ|| BC, what is PB?
9.6 units
10 units
13 units
14 units
Using the triangle proportionality theorem, the length of side PB in the given triangle is 10
Calculating the length of a side of a triangleFrom the question, we are to determine what the length of PB is in the given triangle
From the Triangle Proportionality Theorem which states that "If a line parallel to one side of a triangle intersects the other two sides of the triangle, then the line divides these two sides proportionally".
Thus,
From the given diagram, we can write that
AP / PB = AQ /QC
From the given information,
AP = 4
AQ = 6
QC = 15
4 / PB = 6 / 15
6 × PB = 4 × 15
6 × PB = 60
Divide both sides by 6
PB = 60 / 6
PB = 10
Hence, the length of PB is 10
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Triangle ABC~ Triangle DEF. Find the scale factor from triangle ABC to triangle DEF
Answer:
To go from ABC to DEF, you have to multiply by 8/9
Step-by-step explanation:
40/45 = 8/9
88/99 = 8/9
80/90 = 8/9
Classify the triangle described below.
A triangle with measures of x°, 4x°, and 4x° is a(n) triangle.
We can see that the triangle has two equal angles, then it is an isosceles triangle.
How to classify the triangle?Here we have a triangle where we know that the interior angles are:
x°, 4x°, and 4x°
remember that the sum of the interior angles of any triangle is 180°, then we can write the linear equation:
x + 4x + 4x = 180
Solving that for x we will get:
9x = 180
x = 180/9
x = 30
Then the angles are:
x° = 20°
4x° = 80°
4x° = 80°
We can see that we have two equal angles, then the triangle is an isosceles triangle.
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Gus has a fish tank that holds
4710
47104710 inches
3
3
cubed of water. He is using a cylinder shaped bucket with a radius of
5
55 inches and a height of
20
2020 inches to fill the tank.
How many times will Gus need to fill the bucket to completely fill the fish tank if he doesn't spill a drop?
Use
3.14
3.143, point, 14 for
π
Gus will need to fill the bucket 3 times to completely fill the fish tank, assuming he doesn't spill any water.
To find how many times Gus will need to fill the bucket to completely fill the fish tank, we first need to calculate the volume of the bucket. The formula for the volume of a cylinder is:
V = πr²h
where V is the volume, r is the radius, and h is the height.
Substituting the given values into the formula gives:
V = 3.14 x 5² x 20
V = 3.14 x 25 x 20
V = 1570 inches³
Therefore, each time Gus fills the bucket, he will add 1570 inches³ of water to the fish tank. To calculate how many times he needs to fill the bucket to fill the entire fish tank, we can divide the total volume of the fish tank by the volume of the bucket:
4710 / 1570 = 3
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Complete question is:
Gus has a fish tank that holds 4710 inches³ of water. He is using a cylinder shaped bucket with a radius of 5 inches and a height of 20 inches to fill the tank. How many times will Gus need to fill the bucket to completely fill the fish tank if he doesn't spill a drop?
Find the surface area
The surface area of the prism is 70.44 yd²
What is surface area of prism?A prism is a solid shape that is bound on all its sides by plane faces. There are different types of prism, triangular prism, rectangular prism e.t.c
The surface area of a prism is expressed as;
SA = 2B +pH
where B is the base area and p is the perimeter of the base and h is the height of the prism
Base area = 1/2 bh
= 1/2 × 3 × 3 = 4.5 yd²
The hypotenuse of the triangle = √3²+3²
= √9+9 = √18 = 4.24
perimeter of the base = 4.24+3+3 = 10.24yds
Therefore,
SA = 2×4.5 + 10.24 × 6
SA = 9 + 61.44
SA = 70.44 yd²
therefore the surface area of the prism is 70.44yd²
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Give two pairs of polar coordinates for the point (0, -10)
The required two pairs of polar coordinates for the point (0, -10) are:
(10, π/2) and (10, -π/2)
To convert from Cartesian coordinates (x, y) to polar coordinates (r, θ), we can use the following formulas:
[tex]r = \sqrt{(x^2 + y^2)}\\\theta = \tan^{-1}(y/x)[/tex]
Since the x-coordinate of the point (0, -10) is 0, we can directly say that the angle θ is either π/2 or -π/2, depending on whether y is positive or negative.
For y = -10, we get:
[tex]r = \sqrt{(0^2 + (-10)^2)} = 10[/tex]
Therefore, two pairs of polar coordinates for the point (0, -10) are:
(10, π/2) and (10, -π/2)
Both of these pairs have the same distance from the origin (r = 10) but different angles (π/2 and -π/2).
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(Time limit) Tell if the graph is a function or not.
And give me the domain and range.
Answer:
This graph is not a function.
The domain is -3<x<3.
The range is 1<y<3.
Let X1, X2, ... be IID with mean . Let So O and Sn {k=1 Xk. Let T be a bounded stopping time for the filtration En 0{X1, ..., Xn}. Prove that E[ST] = uE[T]: First show Sk – ku is a martingale. = (Sr] = EL
To show that Sk - ku is a martingale, we need to show that it satisfies the two properties of a martingale:
Sk - ku is integrable for all k.
For any k, E[Sk+1 - ku+1 | E0,...,Ek] = Sk - ku.
First, we show that Sk - ku is integrable for all k:
E[|Sk - ku|] = E[|(X1 + ... + Xk) - k|]
= E[|X1 + ... + Xk| - k] (using linearity of expectation)
≤ E[|X1| + ... + |Xk|] + k (by triangle inequality)
= kE[|X1|] + ... + kE[|Xk|] + k (using linearity of expectation)
= kE[|X1|] + ... + kE[|X1|] + k (since Xi are IID)
= kE[|X1|] + k (since there are k terms)
< ∞ (since E[|X1|] is finite)
Therefore, Sk - ku is integrable for all k.
Next, we show that for any k, E[Sk+1 - ku+1 | E0,...,Ek] = Sk - ku:
E[Sk+1 - ku+1 | E0,...,Ek] = E[(X1 + ... + Xk+1) - (k+1) | E0,...,Ek]
= E[(X1 + ... + Xk) + Xk+1 - (k+1) | E0,...,Ek]
= E[(X1 + ... + Xk) - k | E0,...,Ek] + E[Xk+1 | E0,...,Ek]
= Sk - ku + E[Xk+1] (by the martingale property of Sk - ku)
= Sk - ku + u (since the mean of X1, X2, ... is u)
Therefore, Sk - ku is a martingale.
Now, we can use the optional stopping theorem to prove that E[ST] = uE[T]:
By the optional stopping theorem, we have:
E[ST] = E[(Sk - ku)(T - k) + Sku]
= E[(Sk - ku)(T - k)] + E[Sku]
= E[E[(Sk - ku)(T - k) | E0,...,Ek]] + E[Sku] (using law of total expectation)
= E[(Sk - ku)E[T - k | E0,...,Ek]] + E[Sku] (using linearity of expectation)
= E[(Sk - ku)(E[T | E0,...,Ek] - k)] + E[Sku] (using law of total expectation)
= E[(Sk - ku)(T - k)] + E[Sku] (since T is a bounded stopping time)
= E[SkT - kuT - kS + ku] + E[Sku]
= E[SkT] - uE[KT] - kE[S] + ku + E[Sku] (using linearity of expectation)
= uE[KT] - uE[KT] - kE[S] + ku + E[Sku] (using the optional stopping theorem)
= ku + E[S(T-k)]
= ku + E[Sk - k^2] (since T is a stopping time)
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Brooklyn needs to earn $14 more dollars to have $32. How much money does Brooklyn have now?
Identify the steps needed to write and solve an equation to solve the word problem. Select all that apply.
The variable, m, is equal to the amount of money Brooklyn has now.
The variable, m, is equal to the amount of money Brooklyn needs to earn.
The correct equation is 14 + m = 32.
The correct equation is 14m = 32.
To solve the equation, subtract 14 from both sides.
To solve the equation, divide 14 on both sides.
Answer:
A,C,E
Step-by-step explanation:
Answer:
a and c and e
Step-by-step explanation:
got it right on my home work
Can you please help with this question i dont understand thank you.
1. Cost is proportional to Area includes;
-Carpeting that cost $22 for every 3 square yard
-Cost ($) and Area (ft^2) table
-Mulch that cost a set amount to cover a square foot
2. Cost is not proportional to Area;
- Linear graph
- Asphalt sealant that is quoted at a set price per square foot, plus a labor fee
3. Not enough information
- A wood deck quoted at a bulk cost for 25 square feet.
Why is the Linear graph not proportional to area?The Linear graph is not proportional to the area looking at the coordinates that has been provided. The cost to the yard area does not have a consistent progression. By this, $1,600 should cove 60 yd² instead of 80
The above answer is based on the information provided in the picture as seen below;
Drag each object to show whether cost is proportional to area in the situation represented.
Cost is proportional to Area Cost is not proportional to Area Not enough information
a. A wood deck quoted at a bulk cost for 25 square feet.
d. Asphalt sealant That is quoted at a set price per square foot, plus a labor fee.
c. Carpeting that cost $22 for every 3 square yard
d. Mulch that cost a set amount to cover a square foot
e. Cost ($) Area (ft^2)
500 400
750 600
1000 800
f. A cost ($) and area (yd^2) that has coordinates (0, 0), (20, 1200) (80, 1600)
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A store sells graph paper in packages of 100 sheets. During a sale, they offer a package that has 25% more sheets for no additional cost.How many sheets are in sale package
There are 125 sheets in the sale package.
If a regular package of graph paper contains 100 sheets, then a package with 25% more sheets would contain:
100 + (25/100) x 100 = 100 + 25 = 125
So a package with 25% more sheets would contain 125 sheets.
During the sale, the store is offering a package with 25% more sheets for no additional cost.
This means that the sale package contains the same number of sheets as a regular package, plus an additional 25% of that same number of sheets.
To find the number of sheets in the sale package, we can set up an equation:
Number of sheets in sale package = Number of sheets in regular package + 25% of the Number of sheets in the regular package
or
Number of sheets in sale package = 100 + 0.25 x 100
Simplifying,
Number of sheets in the sale package = 100 + 25
Number of sheets in the sale package = 125
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can someone help me pls it Ricardo has made 4 out of the 12 recipes in his cookbook. What fraction of the recipe has he made? and thank you
Yes, of course!
Ricardo has made 4 out of the 12 recipes in his cookbook.
To find out what fraction of the recipes he has made, you can write it as a fraction:
4/12
To simplify this fraction, you can divide both the numerator and denominator by 4, which gives:
4/12 = 1/3
Therefore, Ricardo has made 1/3 of the recipes in his cookbook.
What is the image of ( − 5 , − 9 ) after a dilation by a scale factor of 3 centered at the origin?
Select the correct answer. Solve for x. x2 + x - 6 = 0 A. -2, -3 B. -2, 3 C. 2, -3 D. 2, 3 Reset Next
Answer: C. 2
Step-by-step explanation: you add 2x and x to get 3x. Then add 6 to the other side to get 3x = 6. Then divide 6 by 3 to get x=2
Suppose that a cylinder has a radius of r units, and that the height of the cylinder is also r units. The lateral area of the cylinder is 512π square units. Find the value of r.
The calculated value of r ihe lateral area of the cylinder is 512π square units is 16 units
Finding the value of r.From the question, we have the following parameters that can be used in our computation:
The lateral area of the cylinder is 512π square units
The lateral area of the cylinder is 2πrh
So, we have
2πrh = 512π
Substitute r for h
2πr^2 = 512π
Divide both sides by 2π
So, we have
r^2 = 256
Take the square roots
r = 16
Hence, the radius is 16 units
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the dilation of the figure is 45,000cm3 what is the scale factor of the dilation
The scale factor of the dilation is 30:1.
We have,
A superhero action figure has a volume of 1500 cm³.
The volume of the dilated figure is 45,000 cm³
Now, the scale factor should be
= 45000/ 1500
= 30 /1
Thus, the scale factor of the dilation is 30:1.
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A particular movie theater charges $7.00 per adult and $2.50 per child. If 600 people attended a movie and the total revenue from ticket sales was, which of the following models the given information if x represents the number of adults and y represents the number of children?
Answer:
Step-by-step explanation:
7x+2.50y=600