4 Eli's family is going to have a big go-cart race and each go-cart takes 3-gallon of gas. If there are 7 go-carts, how many total gallons of gas do they need to fill up all the go-carts?

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.