Convert to improper fraction (multiply whole number by denominator and add numerator, keep the denominator)
5 1/4 = 21/4
4 1/2 = 9/2
Multiply 9/2 by 2/2 to get the same denominator = 18/4
Subtract the numerators, keep the denominator.
21/4-18/4 = 3/4.
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>
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Answer:
they relied more on british trade.
Explanation: