What is 2 3 10 + 1 2 5 ? A. ( 2 + 1 ) + ( 3 10 + 2 5 ) = 3 + 5 15 = 3 5 15 B. 2 + 3 10 + 1 + 2 5 = 5 10 + 3 5 = 5 10 + 6 10 = 11 10 = 1 1 10 C. 2 × 3 10 + 1 × 2 5 = 6 10 + 2 5 = 6 10 + 4 10 = 10 10 = 1 D. ( 2 + 1 ) + ( 3 10 + 2 5 ) = 3 + ( 3 10 + 4 10 ) = 3 + 7 10 = 3 7 10

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

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

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3