SOLUTION: Given: There are 7.3 billion, that is, 7.3*109 people on Earth. If a flu virus starts with one person and within 1 day four more people are infected, then each of those four pe

Question 744744: Given: There are 7.3 billion, that is, 7.3*109
people on Earth. If a flu virus starts
with one person and within 1 day four more
people are infected, then each of those four
people in 1 day infects 4 people each,
and so on, how many days before everyone
on earth is infected?
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
This is an exponential growth problem where the population quadruples every day. Our model equation is:

with
,
which leads to...

t is about...16.4 days
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