Find the approximate area under the curve of y = 4x by dividing the interval between x= 3 and x 5 into (a) n=5 subintervals (Ax 0.4) and (b) n= 10 subintervals (Ax 0.2) subintervals, and then adding up the areas of the inscribed rectangles. The height of each rectangle may be found by evaluating the function for the proper X-value. (a) The area is approximately (Type an integer or a decimal.)

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