The difference of a number and 7 is 21. (1 point) 21– 7 = n; n =14 n + 7 = 21; n = 14 n – 7 = 21; n =28 21 – n = 7; n = 14

What is the value of this expression when b= 5 6 (2b-4)

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

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