A phone plan has a limit of $25 that can be spent on text messages. The base cost of the text plan will cost a user $5. Each text will cost $0.05. How many text messages (t) can a user send without exceeding the plan limits?

The total cost is the $5 base charge plus $0.05 for each text, so the limit requires 5 + 0.05t ≤ 25. Subtracting 5 gives 0.05t ≤ 20, and dividing by 0.05 gives t ≤ 400. Therefore, the user can send at most 400 text messages, which is choice A.

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