Awater tank is being drained at a steady rate. the initial level of the water in the tank was 5.5 feet. the graph below shows the water level over time as the tank is drained. what is the slope of the line graphed?

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