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Empty box + box + empty box fill in the box is equal to 30 how

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

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25