Use Theorem I to compute the shaded area in Exercise 8. Theorem I: Area under a Graph

Use Theorem I to compute the shaded area in Exercise 8.

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Theorem I: Area under a Graph If f(x) is a continuous nonnegative function on the interval a ≤ x ≤ b, then the area under the graph of f(x), above the x-axis, from x = a to x = b is equal to the definite integral of f from a to b: "]-[*Foode = a Area under the graph of f from x = a to x=b where F is an antiderivative of f (Fig. 4). f(x)dx= F(b) - F(a),