Will mark bianleast plz plz i really need this asap What does it mean if the probability is 0% that a blue marble will be drawn form a bag?

The number of blue marbles in the bag is unknown.

There is only one blue marble in the bag.

There are no blue marbles in the bag.

There are very few blue marbles in the bag.

What is 20+(5 x 2/5 )+ 3 show your work

Simply 8x squared + 5(7x squared- x) - 2x =

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297