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The number of cases of a new disease can be modeled by the quadratic regression equation y = –2x2 + 36x + 6, where x represents the year.

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barnuts

To determine the number of cases in year 15, all we have to do is to plug in the equation x = 15. Therefore,

y = -2 * (15)^2 + 36 * 15 + 6

y = 96

There are 96 new disease after year 15.

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