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Answer:
Step-by-step explanation:
Given expression,
=>
We see that is common in both numerator and denominator
hence canceling out we get:-
Answer=
Answer:
A. 2.8 billion years old
Step-by-step explanation:
1/16 = (1/2)^4, so 4 half-lives have elapsed.
4 · 0.700 billion years = 2.8 billion years
The rock is 2.8 billion years old.