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

Where, k is rate constant
So,


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,





So,
<u>The rock is 3.75 billion years ago.</u>
Explanation:
pas compris ??? détails stp
Hey there yo!!!
So the best and most correct answer is
D.The document required trial by a jury of one's peers.
Hope this helps
P.s. I'd really appreciate brainliest answer from u ;)
<span>Dr. Tepper-Harmon is of the belief that life-span development can't be studied without considering several factors such as biological, cognitive, and socio-emotional dimensions. He holds this belief because he has determined that development is multidimensional, and that no conclusion can be drawn from looking at only one aspect of development.</span>