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ZX-1952E466372026年8月美国A卷 · 第 19 题
2026年8月美国A卷 · 原库模块 1 · Q19 参考答案
A scientist initially measures 9,000 bacteria in a growth medium. 8 hours later, the scientist measures 18,000 bacteria. Assuming exponential growth, the formula \( P=C(2)^{rt} \)gives the number of bacteria in the growth medium, where r and C are constants and P is the number of bacteria t hours after the initial measurement. What is the value of r?
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