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bekas [8.4K]
3 years ago
13

A circle has a radius of 8cm. What is the AREA? Use this formula - A = pi X radius squared.

Mathematics
1 answer:
Studentka2010 [4]3 years ago
3 0

Step-by-step explanation:

<u>The formula for the area of a circle:</u> A=\pi r^{2}

<u />

<u>Given:</u>

  • Radius = 8 cm

<u />

<u>Substitute 8 for r (radius):</u>

<u />A=\pi 8^{2}

<u>Solve:</u>

<u />A=\pi (64)

A=64\pi or 201.062 cm^{2} rounded.

<u />

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If y = 6, then what is the value of 9 x y?<br> O 15<br> O 25<br> 0 44<br> O 54
Debora [2.8K]

Answer: 54

Step-by-step explanation:

4 0
3 years ago
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What is the average rate of change for this exponential function for the interval from x=2 to x=4?
mario62 [17]

The equation to calculate the average rate of change is: y/x

y = f(x2) - f(x1)x = x2 - x1

x1: 1 (The smaller x value. It can be any number)x2: 2 (The larger x value. It also can be any number)f(x1): The value when you plug x1 into the function.f(x2): The value when you plug x2 into the function.

If we know this, the variables for this problem are assuming the function is 10(5.5)^x:

x2: 2x1: 1f(x2): 10(5.5)^(2) = 302.5f(x1): 10(5.5)^(1)= 55

This means:y = 302.5  - 55 = 247.5x = 2 - 1 = 1

Remember: the equation for avg rate of change is y/x

So, our average rate of change for the function on the interval [1,2] is 247.5 (y/x = 247.5/1)

5 0
3 years ago
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In details<br> Don't spam
Scrat [10]

Answer:

a = -4.

Step-by-step explanation:

25(√5)^a * (√5) ^3  = 5√5

25*5^a/2 * 5^3/2 = 5*5^1/2

25*5^a/2  = 5*5^1/2 / 5^3/2

25*5^a/2  = 5^1 *5^1/2 / 5^3/2

25*5^a/2 = 5^3/2 / 5^3/2 = 1

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The bases are equal, so

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7 0
3 years ago
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elena-s [515]
I’m pretty sure the answer is 6
4 0
4 years ago
In the triangle below,<br> y = [ ? ] cm. Round to the<br> nearest tenth.
sattari [20]

Answer:

The answer is

<h2>12.3 cm</h2>

Step-by-step explanation:

Since the triangle is a right angled triangle we can use trigonometric ratios to find y

To find y we use cosine

cos∅ = adjacent / hypotenuse

From the question

y is the adjacent

The hypotenuse is 15

So we have

\cos(35)  =  \frac{y}{15}  \\ y = 15 \cos( 35 )  \\ y = 12.28728

We have the final answer as

<h3>12.3 cm to the nearest tenth</h3>

Hope this helps you

7 0
3 years ago
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