Problema Solution
A rectangular blacktop with a length of 5x and a width of 3x has been erected inside a rectangular field that has a length of 12x and awidth of 7x. What is the area of the part of the field that is not blacktop
Answer provided by our tutors
the area of the field - the area of the backtop
12x*7x - 5x*3x = 84x^2 - 15x^2 = 69 x^2