A cell phone plan costs $35 per month plus $0.10 for each text message sent. If a user's bill was $52.50 last month, how many text messages did they send?
✓ Correct Answer: Option A
Set up the equation: 35 + 0.10x = 52.50. Subtract 35: 0.10x = 17.50. Divide by 0.10: x = 175. They sent 175 text messages.