The half-life of carbon-14 is 5,700 years. If 10 percent of the original carbon-14 is left in a structure, that structure is _______ years old.
A) less than 2,850
B) about 5,700
C) between 11,400 and 17,100
D) between 17,100 and 22,800
E) about 57,000
Correct Answer:
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