The graph shows the height h (in meters) of a roller coaster t seconds after the ride starts. Height vs. Time 100 80 60 40 20 10 20 30 40 50 60 70 Time (sec) a. Over what interval(s) does the height increase? b. Over what interval(s) does the height decrease? c. Estimate the times and values of any relative maxima or minima on the interval (0, 70). Height (ft)

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