If the slope of AB is -3/2 then what is the slope of any line that is perpendicular to AB (what’s -3/2 perpendicular)

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