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July 5, 2015

Homework Help: MATH - solving exponential equations

Posted by Cyn on Tuesday, December 1, 2009 at 9:16pm.

The half-life of sodium-24 is 14.9 hours. A hospital buys a 40 mg sample of sodium-24.
a) How many grams, to the nearest tenth, of sodium-21 will remain after 48 h?
b) After how long will only 2.5 mg remain?

I don't know how to write the exponential function in order to be able to solve this. ><

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