Question 1122273
Assume the population quantities is in millions.

Noon, 2.5  million, time 0


3 pm, time  3; population 4.5


{{{2.5*b^3=4.5}}}


{{{b^3=4.5/2.5}}}


{{{b^3=1.8}}}


{{{b=1.2164}}}, approximate cube root of 1.8


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{{{2.5*(1.2164)^x=8}}}
Solve for x.