16 suppose a company Produces and sells car audia recovers . The Profit afte Producing and selling + car audio receivers is given by P ( x ) = - x2 7 980x - 3000 a ) Find the average rate of Change over the interval [ loo, 400 2 B ) Explain the meaning of your answer in Part lay in the context of this Problem Given , two functions f ( x ) = V x 76 and g ( x ) = + find the domain of the following functions a ) ( f + g ) ( x ) B ) f ( g l x ) )