Jeff wants to use mental math to see if he can afford the computer and printer shown at the right. first he makes a ten by adding 527 +3. what does jeff have to do next?

Anyone know? will mark brainliest if you're correct!

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

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