What is 57/5 as a decimal?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Witch represents the inverse of the function f(x)=1/4x-12

Acylinder with a base diameter of x units has a volume of jxcubic units which statements about the cylinder are true? check all that apply. the radius of the cylinder is 2 x units. the radius of the cylinder is 2x units. the area of the cylinder's base is 200 square units. the area of the cylinder's base is a square units. the height of the cylinder is 2x units. the height of the cylinder is 4x units. mark this and return save and exit next submit