PLEASE ANSWER ASAP

What are the solutions (coordinate points) to the system of equations?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way