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BUBBA821
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BUBBA821
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What
a radioactive element has a half-life of 1.1 billion years. A rock contains 6.25% Parent material. How old is the rock.
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BUBBA821
Oct 25, 2016
#1
+6
0
x-5=11
+5 +5
x=16
BUBBA821
Oct 25, 2016
+6 
