21-30. Average values Find the average value of the following func- tions on the given interval. Draw a graph of the function and indicate the average value. 21. f(x) = x³ on [-1,1] 22. f(x) = x² + 1 on [-2, 2] 1 23. f(x) · = 2on [–1, 1] 24. f(x) = cos 2x on [-7. ] x? + 1 25. f(x) — 1/x on [1, e] 26. f(x) = e2* on [0, In 2] 27. f(x) = cos x on [-5, ) 28. f(x) — x(1 - х) on [0, 1] 29. f(x) = x" on [0, 1], for any positive integer n %3D 30. f(x) = x/" on [0, 1], for any positive integer n

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