Let I = ff(x) dx, where f has the values shown in the table. -0.25 0.50 1.25 2.6522 4.8755 6.8328 X f(x) -1.00 0.0000 2.00 8.6790 a. Compute L4, R4, T4, M2, and S4. b. A plot of the data shows that it is reasonable to assume that f is increasing and concave down on the interval [-1,2]. Use this assumption and your results from part (a) to find upper and lower bounds on I. Justify your choices.