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User Derrylwc
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1 Answer

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\begin{gathered} as\text{ she uses 5 pounds every 2 months, the rate of decay is }(5)/(2)=2.5\text{ punds/month} \\ an\text{ equation would be} \\ 120-2.5x \\ \text{where x is the time in months} \end{gathered}

User Markicevic
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