Question

The formula below gives V, the volume of a cylinder with radius r and height 14.

V(r) = 14(pie)r2

What is the value of V(3)?

A. 84
B. 23
C. 112
D. 126

There's a pie symbol between the 14 and r. its not in parentheses.

Answer 1

btw, you mean pi (greek P). pie is something you eat.

v(3) is short-hand for:
find the definition of v( r )
and everywhere you see r in the formula, replace the r with 3
then simplify

can you do that ?

Answer 2

would it be 126(pi) ?

Answer 3

it would be
\[ V(3) = 14\pi 3^2 \\
= 14\cdot 9 \pi \\
= 126 \pi\]

Answer 4

so yes

Answer 5

Okay thanks! that's how I did it.