Solve the Problem $\mathrm { N }$ That Will Survive $x$ Hours Is Modeled by the Formula

question 5

Multiple Choice

Solve the problem.
-For a culture of 70,000 bacteria of a certain strain, the number of bacteria $\mathrm { N }$ that will survive $x$ hours is modeled by the formula $N = 7000 \sqrt { 100 - x }$ . After how many hours will 63,000 bacteria survive?

• A) \(81 \mathrm { hr }\)
• B) \(37 \mathrm { hr }\)
• C) \(19 \mathrm { hr }\)
• D) \(91 \mathrm { hr }\)

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