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Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

What is the value of x when x + 7 = 21?

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?