Six times the sum of a number, x, squared and three 6x^2 + 3^2
6x^2 + 3
6(x + 3)^2
6 (x^2 + 3)

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Pranza plotted point a in the coordinate plane below.

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