If 2 times a number is decreased by 5 the results is 7 find the number

Which representation has a constant of variation of -2.5

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? probability distribution px(x) 6 hours 7 hours 8 hours 9 hours 10 hours 0.62 0.78 пол

50 points~ ! i have to turn this in tomarrow