What is the domain of the relation {(a, b) : ab=12?

How do you find principle and simple interest

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?

With both problems. a.s.a.p directions on photo ^