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cvmsparkle

united states
Joined: Dec 6, 2006
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i need help as soon as possible plz.

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Refer to the following problem situation: The number of bacteria in petri dish culture doubles every 3hr.s Initially there are 2500 bacteria present.

?: Find the complete graph that shows the numeber of bacteria present during the first 24-hr.period.

[Dec 6, 2006 6:31:14 PM]

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pskinner

Joined: Apr 2, 2005
Posts: 797
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Re: i need help as soon as possible plz.

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Sounds like you want to plot 9 points:

(0,2500)
(3,2500*2)
(6,2500*2^2)
(9,2500*2^3)

etc.

(24,2500*2^8)

where (x,y)=(time in hours,number of bacteria in petri dish).

So, the "general" formula in terms of t would be:

(t,2500*2^(t/3))

You can use one of the function graphing calculators and enter:

2500*2^(x/3)

After you see the graph, you can replot over the x-interval, [0,24].
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Principal Skinner

[Dec 6, 2006 8:39:17 PM]

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