8. Below is the graph of a function f(x) with domain (-2,6]. 4.07- -2:2 -2-1.15 0.85 2.72 3:4 4.4 5.656 (a) (2 points) Decide whether the quantity f(x) dr is positive, negative or zero. Brieff justify your answer. 0.85 (b) (2 points) Decide whether the quantity f(x) dr is positive, negative or zero. Briefly justify your answer. 3.4 (c) (2 points) Decide whether the quantity f(x) dr is positive, negative or zero. Briefly justify your answer. 5.65 f'(x) dr. Briefly explain why your answer is correct. (d) (2 points) Compute 10.85