One day your friend presents you with the numbers 2 3 4 and 5 and the symbols = and +; it is possible to use each number and symbol once and only once and end up with a true equation; further, you cannot use any number or symbol not given. how can you do this?

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.