What is 3/6 reduce to its lowest term

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!

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Math it's appreciated. (picture provided)