9. A new virus is very transmissible. Every day, each person who has the virus spreads it to three more people. On day one, a country detects 5 cases. a) On what day are 1215 people infected? Show your work. b) What is the total number of people who have been infected after 7 days? Show your work.

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9. A new virus is very transmissible. Every day, each person who has the virus spreads it to three
more people. On day one, a country detects 5 cases.
a) On what day are 1215 people infected? Show your work.
b) What is the total number of people who have been infected after 7 days? Show your work.
Transcribed Image Text:9. A new virus is very transmissible. Every day, each person who has the virus spreads it to three more people. On day one, a country detects 5 cases. a) On what day are 1215 people infected? Show your work. b) What is the total number of people who have been infected after 7 days? Show your work.
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