A function and its graph are given. rw) - + 4x2 - 20x – 20 250 200 150 100 50 -10 -5 - 50F (a) From the graph, estimate where r"x) > 0. (Enter your answer using interval notation.) Estimate where r"(x) < 0. (Enter your answer using interval notation.) Estimate where r"x) = 0. (Enter your answers as a comma-separated list.) (b) Use (a) to decide where r(x) has its relative maxima and relative minima. (Enter your answers as comma-separated lists. If an answer does not exist, enter DNE.) relative maxima x = relative minima x = (c) Verify your results in parts (a) and (b) by finding rx) and f"(x) and then graphing each with a graphing utility. Find where r"x) > 0. (Enter your answer using interval notation.)

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