I don't understand this question at all we never went over this. -_-

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Simplify the expression. -2/5(10+15m-20n)

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