A 5-inch-by-7-inch photograph was cut to fit exactly into a 4-inch-by-6-inch frame. What is the area, in square inches, of the part of the photograph that was cut off?
The correct answer is C.
The area of a rectangle is given by
area = length × width
A = lw
The area of the picture before cutting is = 7(5) = 35 square inches.
The area enclosed by the frame is = 6(4) = 24 square inches.
Subtracting, 35 - 24 = 11 square inches must be cut off the picture to make it exactly fit into the frame.