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**redsoxfan0825** Thank you very much. There are a couple of other problems I'm having trouble with as well.

"The quantity of a drug in the bloodstream t hours after a tablet is swallowed is given by: q(t) = 351(e^-t - e^-2t) in milligrams

When is the quantity of the drug in the bloodstream maximized? That is, find the value of t that maximizes q(t). Round your answer to two decimal places."

This is a surge function problem, but it's not in the normal format of ate^-bt that I'm used to working with. I can do (1/b) to find t, but I don't know how to find b. My first thought would be to combine e^-t - e^-2t to find b but I'm not sure if I can combine those just because they have the same base.

Also, for part of a problem I need the derivative of e^-kt, would that just be -ke^-kt? Or is k positive?