Using Pythagorean’s theorem
a^2 +b^2= c^2
We know
c=15
b=9
a=?
Sub that in the Pythagorean’s theorem
a^2+9^2 = 15^2
a^2 + 81 = 225
a^2= 225-81
a^2 = 144
a= square root of 144
a= 12
Therefore the answer is 12
Answer:
212
Step-by-step explanation:
3m² + 2p² - 15
Plug in the values.
3(3)² + 2(10)² - 15
Evaluate.
3(9) + 2(100) - 15
27 + 200 - 15
200 + 12
= 212
6.665 grams of the 13 grams remain after 8 hours.
<h3>How much of a 13 gram sample of iron-52 would remain after 8 hours?</h3>
The decay equation for the 13 grams of iron-52 is:
![N(t) = 13g*e^{(-ln(2)/8.3h)*t}}](https://tex.z-dn.net/?f=N%28t%29%20%3D%2013g%2Ae%5E%7B%28-ln%282%29%2F8.3h%29%2At%7D%7D)
Where N is the amount of iron-52, and t is the time in years.
Where we used the fact that the half-life is exactly 8.3 hours.
Now, the amount that is left is given by N(8h), so we just need to replace the variable t by by 8 hours, so we get:
![N(8h) = 13g*e^{(-ln(2)/8.3h)*8h}} = 6.665g](https://tex.z-dn.net/?f=N%288h%29%20%3D%2013g%2Ae%5E%7B%28-ln%282%29%2F8.3h%29%2A8h%7D%7D%20%3D%206.665g)
So 6.665 grams of the 13 grams remain after 8 hours.
If you want to learn more about half-life:
brainly.com/question/11152793
#SPJ1
Do you know how to do it on your calculator?
15. X= — 11/12
16. X= — 14/15