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1-4.

Notice the familiar geometric shape.

Find the area of the negative region and combine
it with the positive area found in part (a).

A (f, 0 ≤ x ≤ 5) + A (f, 5 ≤ x ≤7)

A (f, 0 ≤ x ≤ 5) + A (f, 5 ≤ xk)