math
posted by ayisha on .
Mike would like to enlarge his rectangular front yard which is currently 80 feet by 40 feet. He can only extend the width and length by 5x feet. If x = 7 feet, what will be the increase in area of the front yard?
How can this problem be raised to a higher level of complexity?

Ao = 80 * 40 =3200ft^2 = Initial area.
5X = 5 * 7 = 35ft.
Af = (80 + 35) (40 + 35) = 115 * 75 =
8625ft^2 = Final area.
Ai = 8625  3200 = 5425ft^2 = increase
in area.