The difference of 5 times a number and 7 equals 53

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?

The radius of a sphere is 3 inches. which represents the volume of the sphere?

Solve this problem! extra ! 3025/5.5 = a/90.75