A cellphone company charges you $17 a month plus $0.25 for each text message you send. The total bill last month was $45.50. Which of the following equations could you use to figure out how many text messages you sent?
17x - 0.25 = 45.50
17x + 0.25 = 45.50
17 - 0.25x = 45.50
17 + 0.25x = 45.50
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