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What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

The frequency table shows the results of a survey comparing the number of beach towels sold for full price and at a discount during each of the three summer months. the store owner converts the frequency table to a conditional relative frequency table by row. which value should he use for x? round to the nearest hundredth. 0.89 0.90 0.92 0.96

Determine which postulate or theorem can be used to prove that lmn =nmo