Need help with this question for class, thanks for anyone that can help..

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2 acellus answer