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the half life of a certain substance is 25 years. How long will it take for a sample of this substance to decay to 90% of its original amount ...?
answered Mar 8, 2017
7 votes
74.7k views
There are multiple chickens and rabbits in a cage. There are 72 heads and 200 feet inside of the cage. How many chickens and how many rabbits
answered Feb 10, 2017
5 votes
127k views
Why was the US invasion of Iraq controversial? A.Many nations strongly supported the Iraqi government. B.Iraq had been an ally to the United States and Europe for many years. C.Many did not agree that
answered Nov 11, 2016
2 votes
129k views
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