I need to know the answer for this and a explanation

What is the exact volume of the cylinder? 16in going into the middle of the top of the cylinder and 40in in height a) 25,600(pi)3 b)10,240(pi)3 c)1280(pi)3 d)640(pi)3

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}