Answer:
After 9 and a half days, there would be 512 bacteria in the Petri dish, rounded to the nearest whole bacterium. The number of bacteria in the Petri dish doubles every 24 hours. After 1 day, there would be 16 bacteria; after 2 days, there would be 32 bacteria.
After 9 and a half days, the number of bacteria in the Petri dish will be 8 × 2^9.5, which is approximately 5931.3. Rounding to the nearest whole bacterium, there will be 5931 bacteria in the Petri dish after 9 and a half days.
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