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George has two investments that yield a total of $185.60 in annual interest. The amount invested at 8% is $320 less than twice the amount invested at 6%. How much is invested at each rate? Amount invested at 8%? Amount invested at 6%?

An open box is to be constructed from a square sheet of plastic by removing a square of side 3 inches from each corner, and then turning up the sides. If the box must have a volume of 675 cubic inches, find the length of one side of the open box.

A drug is eliminated through the body through urine. Suppose that for an initial dose of 10 milligrams the amount A(t) in the body of t hours later is given by A(t) 10(0.8)^t. Estimate the amount of the drug in the body 8 hours after the initial drug dose.