Can someone Help plz?

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

See attachment below and find the equivalent of tan(∠qsr)

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab