Ignore my answer! Please help! The parabola has a vertex of (4,7) and passes through the point (2,-5). Write an equation using vertex form: y=a(x-h)2+k. What is the value of “a” in this equation.

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.

Ineed me i stuck and i don’t want to get it wrong

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