Help me please math is a pain...

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

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.