Question

Your Porsche's gas mileage (in miles per gallon) is given as a function M(x) of speed x in miles per hour. It is found that

M'(x) = (3600x^-2 -1) / (3600x^-1 +x)^2

Estimate M'(50), M'(60), and M'(100). (Round your answers to seven decimal places.)