<span>You first need to calculate the circumference as that will give you the distance in one revolution.
Then you multiply the answer you get by 8
Circumference = pi*diameter = 22pi 8 revolutions = 8*22*pi = 176pi
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Answer:

Hence, option (b) - 13w - 7 is correct.
Hope it helps you mate :)
Here is the full question
A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by the given equation. Using this equation, find the time that the rocket will hit the ground, to the nearest 100th of second.
Equation:
y=-16x^2+153x+98
Answer:
10.2 seconds
Step-by-step explanation:
Given equation :
shown the expression of a quadratic equation
Let y =0
∴
0 = 
where;

Using the quadratic formula:

replacing it with our values; we have:

OR 
OR 
Hence, we go by the positive value since, is the time that the rocket will hit the ground.
x= 10.17
x = ≅ 10.2 seconds
Therefore, the rocket will hit the ground, to the nearest 100th of second. = 10.2 seconds
You can try this calculating website called calulatorr soup