How do i solve a quadratic equation like this

Solve.
3n2 = 147

A{–3, 7}

B{–7, 3}

C{–49, 49}

D{–7, 7}

Which of the following expressions is equal to 2x^2+8

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

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account