Answer:
![t \approx 750550.12\,yr](https://tex.z-dn.net/?f=t%20%5Capprox%20750550.12%5C%2Cyr)
Step-by-step explanation:
The time constant of the isotope is:
![\tau = \frac{1.3\times 10^{9}\,yr}{\ln 2}](https://tex.z-dn.net/?f=%5Ctau%20%3D%20%5Cfrac%7B1.3%5Ctimes%2010%5E%7B9%7D%5C%2Cyr%7D%7B%5Cln%202%7D)
![\tau \approx 1.876 \times 10^{9}\,yr](https://tex.z-dn.net/?f=%5Ctau%20%5Capprox%201.876%20%5Ctimes%2010%5E%7B9%7D%5C%2Cyr)
The decay of the isotope is described by the following model:
![\frac{m}{m_{o}} = e^{-\frac{t}{\tau} }](https://tex.z-dn.net/?f=%5Cfrac%7Bm%7D%7Bm_%7Bo%7D%7D%20%3D%20e%5E%7B-%5Cfrac%7Bt%7D%7B%5Ctau%7D%20%7D)
Now, the time is cleared in the equation:
![t = -\tau \cdot \ln \frac{m}{m_{o}}](https://tex.z-dn.net/?f=t%20%3D%20-%5Ctau%20%5Ccdot%20%5Cln%20%5Cfrac%7Bm%7D%7Bm_%7Bo%7D%7D)
![t = - (1.876\times 10^{9}\,yr)\cdot \ln 0.9996](https://tex.z-dn.net/?f=t%20%3D%20-%20%281.876%5Ctimes%2010%5E%7B9%7D%5C%2Cyr%29%5Ccdot%20%5Cln%200.9996)
![t \approx 750550.12\,yr](https://tex.z-dn.net/?f=t%20%5Capprox%20750550.12%5C%2Cyr)
Answer:
its 16 books
Step-by-step explanation:
iv had this problwm b4
<span>There will be 49 pieces, each 1/56 meters long.
</span>
Answer:
1.
a) 40 b) 8 c) 27 2/3 d) 4
2.
a) 93 b) -95 c) -87 d) -81
I believe your answer should be 900,000,000.
If I helped give brainliest!