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Every morning, Matt runs laps around the track for one hour. The number of laps he is able to run in the hour depends on the speed at which he runs.$\newline$$r =$ the number of laps Matt can run in one hour$\newline$$s =$ the speed at which Matt runs$\newline$Which of the variables is independent and which is dependent?$\newline$Choices:$\newline$(A) $s$ is the independent variable and $r$ is the dependent variable$\newline$(B) $r$ is the independent variable and $s$ is the dependent variable