15 A manufacturer needs 51 pounds of plums to make 27 quarts of prune juice. How many pounds of plums
would the manufacturer need to make 18 quarts of prune
juice?

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.