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>
Answer:
The electoral collage is necessary. If we didnt have the electoral collage we would have california and new york deciding the president. and its full of Democrats. dosnt even give republican canidates a chance. its biased and unfair. the electoral collage was made carefully to allow the presidents to be chosen.
The cottage industry paid peasants to produce products
One that is in charge of passage through the gate.
Answer:
Plantation slaves lived in small shacks with a dirt floor and little or no furniture. Life on large plantations with a cruel overseer was oftentimes the worst. However, work for a small farm owner who was not doing well could mean not being fed. The stories about cruel overseers were certainly true in some cases.
Explanation: