Prove that 1/3 root2 is irrational

Which expression is equivalent to the expression shown?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244