What is the answer for this question

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

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.

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)