The fine for driving 70 mph is $25 and the fine for driving 85 mph is $100. On this particular road, when a car brakes suddenly, the function () = \sqrt{40d} can be used to approximate the speed of a car (in mph) when it leaves a skid mark of length feet on the road. write a linear equation that represents the fine for speeding, , as a function of the speed in mph on the state highway.

Find (F∘S)(d) and explain what this function can be used for in context of the problem.