- Why is precalculus so useless?

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If y varies inversely with x, and y = 2 when x = 8, what is k, the constant of proportionality? What mass (in grams) of Mg(NO3)2 is present in 145 mL of a 0.150 M solution of Mg(NO3)2? Can you explain why too.
Thanks? How many people per table at an AP exam? What's .00009 in scientific notation? Graph theory question on 15 vertices graph?