Ice is placed around a bowl of water to lower the temperature. the equation d=−75t+22 d 7 5 t 22 shows the time, t, measured in minutes and temperature, d, measured in degrees celsius. which statement is correct? (a. the temperature of the water decreases 5°c 5 c every 7 minutes.) (b. the temperature of the water increases 7°c 7 c every 5 minutes.) (c. the temperature of the ice that is around the bowl is 22°c 22 c .) (d. before cooling begins, the temperature of the water is 22°c 22 c .)

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem