Question: Pls help, practice test not real test btw. I need complete explanations so I can understand though. decimal places. if marks] 6. A bacteria culture

Pls help, practice test not real test btw. I need complete explanations so I can understand though.

decimal places. if marks] 6. A bacteria culture starts with 10 000 bacteria. After 40 minutes the count is 30 000. What is the doubling period? [4 marks] 7. Due to employee safety negligence at a nuclear waste facility, 2000 tons of a radioactive element is spilled into the nearby pond. The half-life of the radioactive element is 36 days. In order to be declared safe for swimming, based on its size and the amount of water, there must be less than 100 tons of the material found in the pond. How long, to the nearest day, until it is safe to swim again? [4 marks]

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