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What is one half of 29 ounces? What is the output of the function f(x) = x + 21 if the input is 4? The pKa value for H2CO3 is 6.38. What mole ratio of NaHCO3 to H2CO3 is needed to prepare a buffer with a pH of 5.99? P varies directly with the square of R. When R is 4, P is 56. Find P when R is 6.? 0.56 to the nearest tenth?

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