For a certain automobile M x 015x 1 21x 7 3 30 x 60 represents the miles per gallon obtained at a speed of x miles per hou a Find the absolute maximum miles per gallon and the speed at which it occurs b Find the absolute minimum miles per gallon and the speed at which it occurs This occurs at mph a The absolute maximum miles per gallon is Type an integer or decimal rounded to the nearest thousandth as needed