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January 10th, 2016, 10:44 AM  #1 
Newbie Joined: Feb 2015 From: canada Posts: 10 Thanks: 0  find instantaneous rate of change
for 500g of a radioactive substance with a halflife of 5.2 h, the amount remaining is given by the formula M(t) = 500(0.5)^t/5.2 where M is mass remaining and t is in hours. Estimate the instantaneous rate of change in mass at 1 day. I keep getting 2 as the answer. The answer in the book is 0.111. Can someone please show me how to do this? I have no idea what I'm doing wrong. 
January 10th, 2016, 01:21 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,835 Thanks: 733 
I suggest you show us how you did it.

February 23rd, 2016, 04:54 AM  #3  
Math Team Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902  Quote:
Quote:
 

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