6x-3=3x+12 what is the solution to the equation?

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

What are the soultion(s) to the quadratic equation 40- x^2=0

It says factor each expression completely 8y+48