Compare the equation in 1 with the graph in item 2

What is (28 + 7 + 6 + 3) x 1/2 show your work

How to do this , and can some one explain

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.