How do you find the greater rate of change in a problem or table?

Given right triangle xyz, which correctly describes the locations of the sides in relation to

The length and width of a rectangle are consecutive even integers the area of the rectangle is 120 squares units what are the length and width of the rectangle

Oliver had $50 on the day before his birthday. after he recived some money for his birthday , he had $75. write and solve eqaution to find how much money oliver received for his birthday. x+50=75