Question

The volume of a cylinder is V = pirsquaredh. Find h if pi=3.14, V = 128, and r = 8.
Round to the nearest hundredth.
A. 0.56
B. 0.64
C. 0.58
D. 0.52

Answer 1

B

Answer 2

The volume of a cylinder isn't V = pi^2h

Answer 3

V = (pi)(r^2)(h)

Answer 4

so, plug in the numbers
128 = pi(64)(h)

Answer 5

and solve for h

Answer 6

\[V=\pi*r^2*h\]
So you would substitue the values in:
V = 3.14(64)*h
128=200.96*h
You get 0.6369426751592357
And rounding to the nearest tenth gives you: 0.64 Which is B.

Answer 7

Thanks You Guys :)