The function f gives the weekly profit, in thousand dollars, that an airline makes on its flights from Boston to Washington D.C. when the ticket price is p dollars. Interpret the following. f(70) 10 (a) When the ticket price is $70 , the weekly profit to the airline on flights from Boston to Washington is 10000 (b) f'(70)5.5 the weekly profit to the airline on flights from Boston to Washington is increasing by s 5.5 When the ticket price is 70 X per dollar (of ticket price) (c) f(90) -1 by $1 When the ticket price is $90 , the weekly profit to the airline on flights from Boston to Washington is decreasing X per dollar (of ticket price)

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