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Rick is going backpacking in a couple of days and is buying trail mix for the trip. The amount of trail mix he will bring depends on how long he plans to backpack.$\newline$$a =$ the amount of trail mix Rick will bring$\newline$$l =$ the length of the backpacking trip$\newline$Which of the variables is independent and which is dependent?$\newline$Choices:$\newline$(A) $a$ is the independent variable and $l$ is the dependent variable$\newline$(B) $l$ is the independent variable and $a$ is the dependent variable