I really need help plss

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

Solve the formula ax+ by = c for x.

If f(x)=3 over x+2 - square root x-3 then f(7)=