What is the result of adding these two equations?
\begin{aligned} -5x-9y & = 3 5x-9y & = -2 \end{aligned}
−5x−9y
5x−9y


=3
=−2

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

Find the maximum value of p= 4x + 5y subject to the following constraints :

How do you do the foil method with polynomials?