Slope of the lines (-4,-1) and (-5,2)

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!

Ineed if you could explain and give me the answer you! this needs done

Somone me i want to know what 18 hours out of 24 hours in a fraction