Wednesday
September 3, 2014

Homework Help: math

Posted by Kristen on Sunday, June 23, 2013 at 12:30pm.

A researchr assistant made 160mg of a radioactive, and found that there was only 20mg left after 45hours.
a) What is the half-life of this substance?
b) Write a function to represent the amount of substance left after x hours
c) If the researcher kew he needed 100mg of the same substance 12 hours after he was able to make a fresh batch, how much should he initially make?

Please help.i have a feeling that something like this will b on my math exam
Please show some steps so I can understand how u get it.

Thanks a bunch I really appreciate it!:)

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