Help needed on no 8 pls

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points

Abaseball team drinks 10/4 gallons of water during a game. which mixed number represents the gallons of water consumed? a) 1 1/2 gallons b) 2 1/2 gallons c) 2 3/4 gallons d) 3 1/2 gallons