The gardener sells half of his oranges plus three more to his first buyer. the gardener then sells half of his remaining oranges plus three more to his second buyer. finally, the gardener sells half of his remaining oranges plus three more to his third buyer. the gardener is left with 13 oranges at the end of the day after the third (and final) buyer makes his purchase. based on this information, how many oranges did the gardener start out with at the beginning of the day?

Through non-collinear points there is exactly one plane.

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

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?