Which set of points represents a function?

a. (1, 4), (–1, 4), (4, 7), (–4, 2), (3, 6)

b. (–1, 4), (–1, 2), (4, 7), (–1, 2), (3, 6)

c. (1, –4), (–1, 2), (4, –7), (3, 2), (3, –4)

d. (1, 4), (–1, 2), (4, 7), (–1, 3), (3, 4)

Do u just plot the numbers on the graph like (1,

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

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