PLEASE HELP I NEED TO GET MY GRADES UP

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

Aportion of a hiking trail slopes downward at about an 84° angle. to the nearest tenth of a flot, what is the value of x, the distance the hiker traveled along the path, if he has traveled a horizontal distance of 120 feet? a. 143.3 b. 12.5 c. 120.7 d. 130.2

What is the slope of the line that contains the points (-2,1) and (0,-3)