What is the value of x to the nearest tenth ?

Create a question with this scenario you could ask that could be answered only by graphing or using logarithm. 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.

Can someone answer this question for me

Find the domain and range of the following function f(x) = 51x - 21+ 4