For what value(s) of x does y = 0 for the function tan(x)? -270°, -90°, 90°, and 270° -270°, -90°, 0°, 90°, and 270° -360°, -180°, 0°, 180°, and 360° -360°, 0° and 360°

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.