Homework Help: math

Posted by ayisha on Wednesday, January 5, 2011 at 9:12pm.

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?

math - Henry, Saturday, January 8, 2011 at 3:46pm
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.

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