While mining, sara found a large metal bar that weigh 20 pounds. sara was also able to determine that able to determine that the bar has 8 pounds of copper. what percent of the weight of the bar was copper? round your answer to the nearest tenth if necessary.

Find the slope of a line given the following two points

What is the slope of the line shown below?

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