Lucas collects marbles. every time lucas buys forty marbles for four dollars, his grandmother buys lucas twenty marbles for two dollars. if lucas buys two hundred marbles, how many marbles does his grandmother buy for him? how much money does lucas spends for his two hundred marbles?

What is x3+3x2−16x−48 divided by x−1?

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

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