OR A tank originally contains 100 gallon of fresh water. Then water
containing 0 5 Lb of salt per gallon is pourd into the tank at a rate of 2
gal/minute, and the mixture is allowed to leave at the same rate. After 10
minute the process is stopped, and fresh water is poured into the tank at a
rate of 2 gal/min, with the mixture again leaving at the same rate. Find the
amount of salt in the tank at end of an additional 10 minutes.​

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

Factor k2 - 17k + 16. a.(k - 2)(k - 8) b.(k - 1)(k + 16) c.(k - 1)(k - 16)

I’m how many different ways can she give the four remaining flowers to the rest of the teachers in the afternoon