Different strains of a virus survive in the air for different time periods. For a strain that survives I minutes, let N =h (1) be the number of people infected (in thousands). The most common strain survives for to What does the statement h (to + 21) tell you about the number of people infected?

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A: A pair of numbers whose sum and product are both equal to 32.

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A:

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A:

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A: