(a) Use six rectangles to find estimates of each type for the area under the given graph of f, the x-axis, and the lines x = 0 and x = 12. (i) L (sample points are left endpoints) 46 = (ii) R (sample points are right endpoints) R6 = (iii) M (sample points are midpoints) M6 (b) Is L an underestimate or overestimate of the true area? overestimate underestimate (c) Is R an underestimate or overestimate of the true area? overestimate underestimate OO

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