Whats 9+10? Im trying this app :)

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

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in

Rationalize the denominator- 12x/√x-10