I have a quick question on what i have to do. pls help. Do i have to add or subtract those?

Which of the following statement about pascal's triangle are true?

What is the area of the trapezoid shown ?

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