Whats , 3(a+b)+2b / please help I will give you 10 points

Me i've asked this question 3 time asapright triangle abc and its image, triangle a'b'c' are shown below. algebraically prove that a clockwise and counterclockwise rotation of 180o about the origin for triangle abc are equivalent rotations.

Suppose you have a 40 percent chance of getting a job offer from your first choice firm, a 40 percent chance of getting a job offer from your second choice firm, and a 16 percent chance of getting a job offer from both firms. what is the probability that you will get a job offer from either firm?

Which graph represents the probability distribution for a randomly selected student?