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A cell phone company charges a flat rate of $3.99 per month, with an additional charge of $0.05 per minute. How many minutes did Casey talk on her cell phone if her monthly bill was $38.44?

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ChoiSungHyun

Step-by-step explanation:

Monthly bill - Flat rate = $38.44 - $3.99 = $34.45.

Minutes used = $34.45 / $0.05 = 689.
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