Answer:
12.50
Step-by-step explanation:
18.20-5.60= 12.50
A. 2.8 billion years old
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 : 331 minutes
So, the coefficients are 24, -3, and 7. The letters next to the coefficients are called "variables".
