Find the selling price of a $15.25 pair of socks with a 18% discount. Round to the nearest cent when necessary.
I know the answer is NOT $12.50

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.