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Roy is having the carpets in his house cleaned. The area of the carpets is used to calculate the cost of the cleaning.$\newline$$a=$ the area of the carpets$\newline$$\mathrm{c}=$ the cost of the cleaning$\newline$Which of the variables is independent and which is dependent?$\newline$(A) $a$ is the independent variable and $c$ is the dependent variable$\newline$(B) $c$ is the independent variable and $a$ is the dependent variable