Adam is painting the inside walls of a 4-walled shed. The shed is 5 feet wide, 4 feet deep, and 7 feet high. How much paint will Adam need?

Find the area of all of the sides of the shed. Two walls measure 5 feet by 7 feet; the other two walls measure 4 feet by 7 feet.
A = 2l1w1 + 2l2w2
A = 2(5 ft)(7 ft) + 2(4 ft)(7 ft)
\(A = 70 ft^2 + 56 ft^2 =126 ft^2\)