31. Temperature readings T (in °C) were recorded every two hours from midnight to 2:00 PM in Atlanta on a day in June. The time t was measured in hours from midnight. t 0 4 6 8 10 23 21 20 19 21 26 28 30 T 2 12 14 (a) Use the readings to sketch a rough graph of T as a function of t. (b) Use your graph to estimate the temperature at 9:00 AM.

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