5. (a) If f (x) represents the slope (also known as \"grade\") at mile :13 of a road starting 10 at sea level, what is the meaning of 5280 f (x) dm? 0 (b) If g(t) represents the rate of growth of a child, measured in inches per year, What 14 is the meaning of i] 905) dt? (Specify the units Clearly in both parts.) in