9] Given the function NU} = i}.{l''65x3 + .{l{l?2xz (1.1331: + 2.062 represents the number N [in millions} of hearing'impaired Arneri cans who are it years old. a} Approximately howI many Americans are hearing impaired at 6|] years old? h} Find the rate of change function Nit] c] Find and interpret and} 1H} The Mini E2 key chain ashlight has a cost function of C(17) = 8:91:11 + 3M] where x is the number of Mini EZ's produced. and CDC} is the total cost in dollars. at Find the total cost to produce 15 Mini E2 kevdtains. it} Find the Marginal Cost function MCix] c] Find the Marginal Cost when 31 Mini E2 keychains have been produced and interpret your