What are the different ways of representing a linear function?

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

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.

Find the sixth term of the following geometric sequence.