John is giving out chocolate to his friends. if he want to give each friend 2/3 of chocolate bar and he has 13 friends, how many chocolate bars will he need to buy.

1. are the triangles similar and if so why? what is the value of x? show your work.

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

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