John R. answered • 01/10/13

John R: Math, Science, and History Teacher

The amount of carpet that is needed is equal to the area of the floor. Since the dimensions given are 7 ft long and 9 ft wide, I am going to assume that the room is a rectangle.

The formula for the area of a rectangle is: Area = Length X Width

Area = 7 ft X 9 ft

Area = 63 ft^{2}

Notice that the units on the area are square feet (ft^{2}) since the units are multiplied by each other.