exponential growth and decay questions

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Question description

Few questions left on my exponential growth and decay questions precalc worksheet.
1. A pesticide kills 40% of the bugs in a house per hour. If 25 bugs remain after 5 hours, how many bugs were originally in the house?

so far i have (1-.4)^5

2. A chemical spill occurs near a lake. Biologists estimated the original fish population to be 9000. Five days after the spill, biologists estimated the fish population to be 2700. Find the death rate of the fish. I got 27.226% is that correct?

3. Just before first period started, Cindy Lou who told Billy some juicy gossipy about you know who concerning you know what. The rumor spread.

A. If 400 people did not know the rumor at the beginning of school, and only 10 people did not know the rumor at the end of school 7 hours later what was the rate the rumor spread? I got 69.381%

B. How many people did not know about the rumor at lunchtime after 3.5 hours?


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