Which expression shows you how you can use mental math to simplify the expression (53 + 23) + 7 most easily? 53 + (23 + 7)(23 + 53) + 77+ (23 + 53)7+ (53 + 23)

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