The temperature T (in units of 1000F) of a university classroom on a cold winter day varies with time t (in hours) as
Suppose T = 0 at 9:00 A.M., the heating unit is ON from 9–10 A.M., OFF from 10–11 A.M., ON again from 11 A.M.–noon, and so on for the rest of the day. How warm will the classroom be at noon? At 5:00 P.M.?
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