The amount of sales tax on a clothing purchase is directly proportional to the purchase price of the clothing. the sales tax on a $60 sweater is $4.20. determine the constant of variation (sales tax percentage).

State one method by which you can recognize a perfect square trinomial.

Solve 17= -13 - 8x and show your work.

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.