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What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect

Juanita wade's new car has an msrp of $28,902.11 including title and processing fees. the premier package which includes surround sound and dvd player costs three times the amount of the in-style package which includes leather seats and select wheels. the total cost of her new car was $34,290.08 which included the 6.5% sales tax. find the cost of the premier package to the nearest cent.