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Mike repairs televisions. His revenue, in dollars, can be modeled by the equation y = 25 + 30x, where x is the number of hours spent repairing televisions. His overhead cost, in dollars, can be modeled by the equation

y=5x2−10

, where x is the number of hours spent repairing televisions.

After how many hours does he break even?

Note: The phrase break even refers to the value where the two functions are equivalent.

Enter your answer in the box.