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April 19, 2014

Homework Help: Pre-Calculus

Posted by Shreya on Tuesday, October 16, 2012 at 10:05pm.

Exponential Functions

A=P(X)^t/n

A-final amount
P-initial amount
X-growth rate
t-time
n-number of growth periods

The teacher had this question as an example and did it however i do not understand one thing:

The Ebola virus double every 30 min. If there are currently 2000 ebola viruses present in petrie dish, how many are present in 7 hours from now?

A=2000(2)^7/0.5 = 32768000

^ What I dont get about that is where he got the 0.5 from? Isnt it supposed to be 30 min? so 30? cause thats the growth period :|

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