HELP ME, PLEASE!! David is struggling in understanding operations with complex numbers.
Here is David's solution to a problem: (4 + 2i) + (5 + 3i) = (4 + 5) + (2i + 3i) = 9 + 5(-1) = 4.

Find David’s errors and describe them in the space below.

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

Complete each sentence with the correct form of the verb ser or estar to say where the following people are from or where they are right now claudia y maria en méxico

I’m really confused and need to learn this