Find algebraically the equation of the axis of symmetry and the vertex of the parabola represented by the equation y=-x^2-2x+1

How many different triangles can be constructed with the angle measurements of 134° 10° and 36° ?

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

Can any one me with the answers to these questions asap?