The cell phone company charges $42 plus .02 per text (t). Which algebraic expression represents the total charge per month?
A. 42.02t
B. 42 + .02t C. 44t. D. 42 + t
PLEASE HELP

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

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