If a stock price goes from $10 to $12 from January 1st to January 31, from $12 to $9 from February 1st to February 28th, and from $9 to $15 from March 1st to March 31th is the price change from $10 to $15 a straight line?
It is not a straight line, this is one example of a piecewise function where there are 3 functions with different domains. The domains would be the days of the month on the X vector and the ranges would be the prince on the Y vector
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