Please help me solve this it’s really important!

What is the slope of a line that is perpendicular to y = 3x + 1

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

Arational number that is equivalent to -20/4?