David is building a toy box and needs bolts and washers from
the hardware store. How much
will David pay for 16 bolts and a
washer for each?
bolts $0.87 each
washers $0.12 each

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.