Originally Posted by

**fezz349** A drug is administered intravenously for pain. The function

f(t)=90 - 52 ln (1 + t), 0__<__t__<__4 gives the number of units of the drug in the body after t hours.

a. What was the initial number of units of the drug administered?

b. How much is present after 2 hours.

c. Draw the graph of f.

In part a, you substitute t for 0. So you have 90-52 ln (1 + 0). and i know that Ln1 aways = 0 . So 90-52n(1) = 90. i don't know just doesn't sound right to me for some reason. Then you plug in 2 for t. I have a feeing there's some set method for answering this kind of equation but it evades me.