use riemann's sum to find the approximate area using rectangles

Using intervals dx=5/3

Lower Riemann sum = (4 *0+ 1) + + (4 *5/3+ 1)+ (4 *10/3+ 1)+ (4 *15/3+ 1)

= 1 + 7 2/3+ 14 1/3 +21

= 44

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