4 and negative 4 have a sum zero

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

The radius of the base of a cylinder is 10 centimeters, and its height is 20 centimeters. a cone is used to fill the cylinder with water. the radius of the cone's base is 5 centimeters, and its height is 10 centimeters.

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.