Radiochemical techniques are useful in estimating the solubility product of many compounds. in one experiment, 70.0 ml of 0.030 m agno3 solution containing a silver isotope with a radioactivity of 74,025 counts per min per ml were mixed with 300.0 ml of a 0.080 m naio3 solution. the mixed solution was diluted to 700.0 ml and filtered to remove all of the agio3 precipitate. the remaining solution was found to have a radioactivity of 44.4 counts per min per ml.

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

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

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.