Someone please help me to solve this (8.99 x 10^9) (3 x 10^-5) (-6 x 10^-5)

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.

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1

The anwser cause i do not understand just plez