For the following system, if you isolated x in the first equation to use the substitution method, what expression would you substitute into the equation? -x-2y=-4 3x+y=12

When turned about its axis of rotation, which shape could have created this three-dimensional object?

The table above shows approximate conversions from gallons to liters. what is the value of x?

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