#### 3200
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- \( \sqrt{77} \approx 8.77 \) cm.
- #### 8.771. A virologist is testing a new antiviral compound on a culture of 1000 virus particles. After applying the compound, 60% of the viruses are neutralized in the first hour. In the second hour, 30% of the remaining viruses are neutralized. How many virus particles remain active after two hours?
- #### 77.38%
- #### 32.4
- #### 97.3%
- #### 155
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