Write an equation in slope-intercept form for the line with y-intercept −8 and slope 1/3

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

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Tell whether the two rates form a proportion