Please help Factor the expression by grouping. Show and
DESCRIBE every step in words.
I
3x^4 - 5x^2 + 9x^2 - 15

Measures of the angle of r, 31 s (x+4) t (3x+9)

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

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?