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Bacteria Population Growth

A bacteria colony doubles in size every hour. At 1:00 pm there are 10 bacteria in a petri dish. At 9:00 pm on the same day, what is the bacteria population?

1
2
3
+
4
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9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$