A drug is administered intravenously for pain. The function ƒ(t) = 90 - 52 ln (1 + t), 0<=t<= 4 gives the number of units of the drug remaining in the body after t hours.
a. What was the initial number of units of the drug adminis-tered?
b. How much is present after 2 hours?
c. Draw the graph of ƒ.
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