Posted by Miguel on Thursday, June 10, 2010 at 9:56pm.
The burial cloth of an Egyptian mummy is estimated to contain 57% of the carbon14 it contained originally. How long ago was the mummy buried? (The halflife of carbon14 is 5730 years.)

Precalculus  drwls, Thursday, June 10, 2010 at 11:48pm
Solve this equation:
(1/2)^(y/5730) = 0.57
y is the age in years.
Hint: take the log of both sides (to any base), and solve for y/5730.

Precalculus  drwls, Thursday, June 10, 2010 at 11:59pm
y = 4650 years (rounded off)
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