Question: The average weekly temperature in Washington, D.C., t weeks after the beginning of the year is The graph of this function is sketched in Fig.

The average weekly temperature in Washington, D.C., t weeks after the beginning of the year isf(t) = 54 + 23 sin [23/27 (-12)]. (t 52

The graph of this function is sketched in Fig. 12.

(a) What is the average weekly temperature at week 18?

(b) At week 20, how fast is the temperature changing?

(c) When is the average weekly temperature 39 degrees?

(d) When is the average weekly temperature falling at the rate of 1 degree per week?

(e) When is the average weekly temperature greatest? Least?

(f) When is the average weekly temperature increasing fastest? Decreasing fastest?

f(t) = 54 + 23 sin [23/27 (-12)]. (t 52

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