For a car with standard tires stopping on dry asphalt, its speed S (in mph) can be found from the length of its skid marks according to
S = 9.4L^0.37
where L is the length (in feet) of the skid marks. Find the error and the relative error in the speed for the skid-mark length if the error in measuring the length is ±10 feet.† (Round your answers to two decimal places.)
160 feet.
I need error and relative error in mph and % respectively.