Answer:
I believe the answer is B.
Explanation:
correct me if im wrong :)
EDIT: I DID THE PRACTICE FOR IT..ITS CORRECT YESSSSSSSSSSSSS
Yes we are innocent always and sad took seriously is b
Answer:
The rock is 3.75 billion years ago.
Explanation:
Given that:
Half life = 1.25 billion years
1 billion years = 10⁹ years
So,
Half life = 1.25 × 10⁹ years
![t_{1/2}=\frac {ln\ 2}{k}](https://tex.z-dn.net/?f=t_%7B1%2F2%7D%3D%5Cfrac%20%7Bln%5C%202%7D%7Bk%7D)
Where, k is rate constant
So,
![k=\frac {ln\ 2}{t_{1/2}}](https://tex.z-dn.net/?f=k%3D%5Cfrac%20%7Bln%5C%202%7D%7Bt_%7B1%2F2%7D%7D)
![k=\frac {ln\ 2}{1.25\times 10^9}\ year^{-1}](https://tex.z-dn.net/?f=k%3D%5Cfrac%20%7Bln%5C%202%7D%7B1.25%5Ctimes%2010%5E9%7D%5C%20year%5E%7B-1%7D)
The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹
Initial amount [A₀] = 80 micrograms
Final amount
= 10 micrograms
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D)
So,
![10=80\times e^{-5.5452\times 10^{-10}\times t}](https://tex.z-dn.net/?f=10%3D80%5Ctimes%20e%5E%7B-5.5452%5Ctimes%2010%5E%7B-10%7D%5Ctimes%20t%7D)
![80e^{-5.5452\times \:10^{-10}x}=10](https://tex.z-dn.net/?f=80e%5E%7B-5.5452%5Ctimes%20%5C%3A10%5E%7B-10%7Dx%7D%3D10)
![\frac{80e^{-5.5452\times \:10^{-10}x}}{80}=\frac{10}{80}](https://tex.z-dn.net/?f=%5Cfrac%7B80e%5E%7B-5.5452%5Ctimes%20%5C%3A10%5E%7B-10%7Dx%7D%7D%7B80%7D%3D%5Cfrac%7B10%7D%7B80%7D)
![\ln \left(e^{-5.5452\times \:10^{-10}x}\right)=\ln \left(\frac{1}{8}\right)](https://tex.z-dn.net/?f=%5Cln%20%5Cleft%28e%5E%7B-5.5452%5Ctimes%20%5C%3A10%5E%7B-10%7Dx%7D%5Cright%29%3D%5Cln%20%5Cleft%28%5Cfrac%7B1%7D%7B8%7D%5Cright%29)
![x=\frac{10^{10}\times \:3\ln \left(2\right)}{5.5452}=3.75\times 10^9](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B10%5E%7B10%7D%5Ctimes%20%5C%3A3%5Cln%20%5Cleft%282%5Cright%29%7D%7B5.5452%7D%3D3.75%5Ctimes%2010%5E9)
So,
<u>The rock is 3.75 billion years ago.</u>
Answer:
ehem... where is tha image??
Explanation:
<span>Ishmael at
last starts to have faith in the mantra with the assistance of Esther. She
would listen and make inquiries about the stories he would enlighten her
concerning his life in the war and her voice one day simply sunk in. After some
time he would reveal to her to an ever increasing extent and the way she was
with him let him realize that he was only a child who was constrained into war.</span>