Answer:
52,25,30,35 is the answer
Step-by-step explanation:
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.
Answer:
81
Step-by-step explanation:
divide 1701 by 21 to get the answer