Question 1174889
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<pre>

60 minutes comprise  {{{60/8}}} = {{{15/2}}} = 7.5 doubling periods.


THEREFORE,


    450 = {{{x*2^7.5}}},


where x is the starting number of bacteria.


From this equation,


    x = {{{450/2^7.5}}} = use your calculator = 2.49 bacteria.


You may round it as you want.  


I prefer to round to the closest greater integer number, which is 3.
</pre>

Do not accept any other answer/solution,


and ignore the post by @josgarithmetic, which is INCORRECT and may confuse you.



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For bacteria growth problems, see the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/logarithm/Bacteria-growth-problems.lesson>Bacteria growth problems</A> 

in this site.


Also, &nbsp;you have this free of charge online textbook in ALGEBRA-I in this site

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-I - YOUR ONLINE TEXTBOOK</A>.


The referred lessons are the part of this online textbook under the topic "<U>Logarithms</U>".



Save the link to this online textbook together with its description


Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson


to your archive and use it when it is needed.