Ratios and Unit Rate Pretest

The table shows the cost of long distance calls based on the number of minutes used. Is there a constant rate of change, and if so what is it?

• Yes, 10 calls per minute

• Yes, $.10 per minute

• Yes, $.40 per minute

• Not a constant rate

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• a
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• a
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• 5:12
• 7:12
• 5:7
• 7:5