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is the set of multiples of 4 closed under addition? explain why or provide a counterexample if not. a. yes, because the sum of any two multiples of 4 is also a multiple of 4. b. yes, because the sum of any two multiples of 4 is also a multiple of 8. c. no, and a counterexample is –4 + (–8) = –12. d. no, and a counterexample is 26 + 16 = 42.

You are a male who just graduated from college with a bachelor's degree. you have a job paying $50,780.00/yr. a. how does your salary compare to the yearly median earnings for a male with a bachelor's degree? b. what is the difference between the yearly median earnings for a male with a bachelor's degree compared to a male who does not attend college after earning a high school diploma?