- What is k2?

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How long arc ACB in the figure if the radius of the circle is 6? What is the difference between subliminals and isochronic tones? Find the sum of first 25 terms of arithmetic sequence 4,9,14,19,24...? If potassium is found in rocks how would using the half life of potassium 40 be helpful in dating fossils of living organisms? In what ways are all main sequence stars alike and in what ways are they different?