Approximating the Area of a Plane Region In Exercises 1-6, use the rectangles to approximate the area of the region. Compare your result with the exact area obtained using a definite integral. See Example 1. 1. f(x) = -2x+3, [0, 1] 2. f(x) = [1, 5] 2 0.5 5. Usi Mid regi 1 2 3 4 5 inter 7.