I need helppp this is due today help with all 4 plxz

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

What are the soultion(s) to the quadratic equation 40- x^2=0

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