CAN SOMEONE HELP ME PLS I GIVE BRAINLIST AND MANY POINTS

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

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

God's gym charges a sign-up fee of $100 plus $30 per month. write an expression to represent how much someone would pay for a membership.