Solve the Problem $\mathrm { D } ( \mathrm { h } ) = 4 \mathrm { e } ^ { - 0.35 \mathrm {~h} }$

Short Answer

Solve the problem.
-A cancer patient undergoing chemotherapy is injected with a particular drug. The function $\mathrm { D } ( \mathrm { h } ) = 4 \mathrm { e } ^ { - 0.35 \mathrm {~h} }$ gives the number of milligrams D of this drug that is in the patient's bloodstream h hours after the drug has
been administered. How many milligrams of the drug were injected? To the nearest milligram, how much of the
drug will be present after 2 hours?