Please help me i dont understand

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents