Lizzy's bank account earns 6% simple interest per year. She deposits $500, and after some time she earns $210 in interest. How much time, in years, must have passed in order for her to earn this much interest?

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.