True/false: the vertical axis in a bar chart always shows relative frequencies

Answer this question, only if you know the answer. 30 points and brainliest!

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.

The sum of a number and 5 times the number is 18.find the number