PLEASE SOMEONE HELP AND GIVE ME A ACTUAL ANSWER

What is the inverse of the function f(x)=4x+8

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

A(t)=728(1+0.04)^t how much money did aditya originally invest