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- 100 Using the table, estimate f (t) dt. Assume that f(t) is an increasing function. 0 20 40 60 80 100 f (t) 1.0 3.3 4.4 5.2 7.3 7.6 Estimate the integral using the average of left- and right-hand sums. 100 f (t) dt = iConsider the function f(x) = x. 2 Illustrate the area represented by/ f (x) dx and use your illustration to compute the area exactly. 1 [2f(x)dx = n