Derek threw a tennis ball up in the air. the following table represents the height f(t), in meters, of the ball above the ground at time t seconds:
time (t)(in seconds) height f(t)(in meters)
1 15
2 20
3 15
4 0
which of the following is represented by the x-intercept of f(t)?
a.) the ball touches the ground after 4 seconds.
b.)the ball was thrown from a height of 0 meters.
c.) the ball reaches a maximum height of 20 meters.
d.) the ball reaches the maximum height in 2 seconds.

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