Solve the problem. See Example 10.Drug Levels in the Bloodstream  When a drug is taken ora...

Solve the problem. See Example 10.

Drug Levels in the Bloodstream  When a drug is taken orally, the amount of the drug in the bloodstream after t hours is given by the function defined by y = f(t), as shown in the graph.

(a) How many units of the drug are in the bloodstream at 8 hr?

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(b) During what time interval is the drug level in the bloodstream increasing? decreasing?

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(c) When does the level of the drug in the bloodstream reach its maximum value, and how many units are in the bloodstream at that time?

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(d) When the drug reaches its maximum level in the bloodstream, how many additional hours are required for the level to drop to 16 units?

Drug Levels in the Bloodstream

EXAMPLE 10

INTERPRETING A GRAPH