Question 37 (1 point) (03.09)
What is the equation of the quadratic graph with a focus of (3, -1) and a directrix
of y = 1? (1 point)
1) f(x) = -1/4 (x - 3)2 + 1 2) f(x) = -1/4 (x - 3)²
3) f(x) = 1/4 (x - 3)²+ 1
4) f(x) = 1/4 (x - 3)²

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

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd