kris spent $131 on shirts. blue shirts cost $28 and red cost $15. if he bought a total of 7 then how many of each kind did he buy?

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

Find an equation for the linear function which has slope -10 and x-intercept -7

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