Answer:
320 square units
Explanation:
The four rectangles that approximate the area are shown in the graph. They have heights of 48, 64, 48, and 0. The width of each is 2. Then the total area is the sum of the products of length and width:
2·48 +2·64 +2·48 +2·0 = 2·160 = 320 . . . square units