Solve the problem.
The graph of y = f(x) represents the amount of oil in millions of gallons remaining in a tank after x days. (i) Approximate f(3) and f(5). (ii) At what rate was oil being drained from the tank when 
A. f(3) ? 32.5, f(5) ? 25; about 15 million gallons per day
B. f(3) ? 42.5, f(5) ? 17.5; about 3.75 million gallons per day
C. f(3) ? 37.5, f(5) ? 27.5; about 7.5 million gallons per day
D. f(3) ? 35, f(5) ? 27.5; about 12.5 million gallons per day
Answer: C
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