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>
The word assertiveness means that is a way of providing
assurance towards self or others in a way that the individual does not worry
and he or she is likely to act more confident or courageous towards one’s self
or towards other people.
<span>Some of these trade routes had been in use for centuries, but by the beginning of the first century A.D., merchants, diplomats, and travelers could (in theory) cross the ancient world from Britain and Spain in the west to China and Japan in the east</span>
punishment
Punishment is the change in the
environment that occurs after a response which decreases the likelihood of the behavior
occurring again in the future. This is according to operant conditioning--a learning
process where a behavior is altered by reinforcement or punishment.
C.The president proposes several new bills that are all rejected by Congress.
When the president uses an executive order to enact a new policy it undermines the power of the Congress, which will result in the congress rejecting the next steps that the president woul try to do.
