(04.04 MC) Given the directrix of y = −1 and focus of (0, 3), which is the equation of the parabola?

choices:
y = one eighthx2 − 1
y = −one eighthx2 + 1
y = one eighthx2 + 1
y = −one eighthx2 − 1

How do i do this activity, is appreciated

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

Acar loses a quarter of its value every year. it is originally worth $35,000. to the nearest dollar,how much will the car be worth in 8 years?