Question

Can someone please help me on number 19

Answer 1

`12\pi x^(2) +21\pi x+9\pi`

Explanation:

`V=Bh=\pi r^(2) h = \pi (4x+3)^(2) (3x+3) = \pi (12x^(2)+12x+9x+9 )=12\pi x^(2) +21\pi x+9\pi`