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 ![[A_t]](https://tex.z-dn.net/?f=%5BA_t%5D)
= 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: She is reading a Theory
Explanation:
A theory is defined as the set of principles and knowledge that govern a science, doctrine, or activity. In Andrea's case, she is reading an introductory topic on human aggression. Issues like these are supported by a series of theories that try to explain their cause.
Dyslexia, it basically is when you read letters in words incorrectly so, for example, I could write I like red and some dyslexic people would read it as I like bed.
