6/7 divided by 3/7

Dkekks

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!

Which of the following is true for the relation f(x)=2x^2+1

Having a hard time understanding this question (see attachment).