Choose the correct equation of the circle. Center: (13,13) Radius: 4 (don't judge me i was 2 lazy 2 type all the answer options until i discovered the answers where pics so i copied and pasted options here)

Find the quotient. 50a2 – 98b2 -5a +7b

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 value of x for which line a is parallel to line b