Question 744744
This is an exponential growth problem where the population quadruples every day. Our model equation is:

{{{P=P[0]*4^t}}}


with 

{{{P[0]=1}}}, {{{P=7.3x10^9}}}

which leads to...

{{{7300000000=4^t}}}


{{{log7300000000=log (4^t)}}}


{{{t=(log7300000000)/log4}}}

t is about...16.4 days