What is the measure of R?

7+(3n++8) what is the answer to this?

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? 0.62 0.78 0.84 0.96

Find the volume of the wedge cut from the first octant by the cylinder z=12-3y^2 and the plane x+y=2.