I am so confused this doesn't make any sense

What is the inverse of the function f(x)=4x+8

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.

What is the solution of the systems of equations? y=2/3x+3 x=-2