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[10] (20 pts) Use a Riemann sum with 4 subintervals and left endpoints to estimate the integral gr dx. Express your answer as a rational number in lowest terms.[11] (20 pts) For the polynomial function (with domain all real numbers) f(:L') = 3:3 3332 + 4 = (a: + 1)(:s 2)2, nd: :3- and y intercepts; intervals of increase/decrease and local extrema; the intervals on which the function is concave up and concave down. Use this information to sketch a graph of the function