A city is comparing the amount of time traffic lights stay green for two intersecting streets. The equations below represent the amount of time, y,
that a light stays green on Snowy Lane and Ranger Avenue, respectively, as
a function of the number of cars, x, that travel through the intersection.
How many cars must pass through the intersection for the green lights of
the two streets to last an equal amount of time? *
y = kx + 10
y= 22 + 4
6
13
4
10

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

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