What is 20 songs to 70 songs increase

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Which of the following graphs represents the function f(x) = 2^x

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?