A mobile phone carrier charges an extra fee if a customer uses more than 500 minutes each month. Tom has already used 230 minutes this month. Which inequality can be used to determine how many more minutes Tom can use this month without going over the 500 -minute limit?

Let m represent the additional minutes Tom uses. His total use will be 230 + m minutes, and staying within the 500-minute limit means the total can be 500 or less. Therefore, 230 + m ≤ 500, which is choice A, “230 plus m is less than or equal to 500.”

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