For her phone service, raina pays a monthly fee of $22, and she pays an additional 0.05 cents per minute of use. the least she has been charged in a month is $91.05. what are the possible numbers of minutes she has used your phone in a month?

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

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?