82.1 / 7.8= What is the answer yall

Which is an equation for the nth terms of the sequence 12,15,18,21

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

Select the two pairs of figures that are similar.