A downtown parking lot charges $5 per hour for the first 2 hours, then $2.50 per hour after that. Which equation(s) describes the total cost y as a function of the hours x?   1. Y = 5x + 2.5(x-2)   2. Y = 5x + 2.5x 3. Y = 5x for 2 hours or less, then Y =10 + 2.5(x-2) for over 2 hours 4. Y = 5x up to 2 hours then Y = 5x + 2.5x for over 2 hours

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