For this case, we must make a rule of three, to find the percentage of the k-40 found in the sample found.
1.3 ----------> 100%
1 -------------> x
Where "x" represents the percentage of k-40 present in the sample found.
![x = \frac {1 * 100} {1.3}\\x = 76.9230](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%20%7B1%20%2A%20100%7D%20%7B1.3%7D%5C%5Cx%20%3D%2076.9230)
Rounding off we have:
76.92%
ANswer:
Option A
Answer:
k < -4 or k > 13
Step-by-step explanation:
Let's take a look at the graph, we can see that the arrows point towards both directions, both dots are open, meaning that we can only have < and > signs. We can see that the arrow pointing to the left contains numbers that are less than -4, so that part of the compound inequality must be k < -4. And on the other side, they are numbers that are greater than 13, so that part must be k > 13. Thus, the answer must be d.
Hopes this helps.
Answer:
C
Step-by-step explanation:
Let us first write an equation. Using the SOHCAHTOA rule, we should know that the tangent of an angle equals it's
. The opposite of our given 20° angle is 9, and the adjacent side is <em>x</em>.
°![)=\frac{9}{x}](https://tex.z-dn.net/?f=%29%3D%5Cfrac%7B9%7D%7Bx%7D)
![0.364=\frac{9}{x} \\x=\frac{9}{0.364}\\x=24.7](https://tex.z-dn.net/?f=0.364%3D%5Cfrac%7B9%7D%7Bx%7D%20%5C%5Cx%3D%5Cfrac%7B9%7D%7B0.364%7D%5C%5Cx%3D24.7)
<u>C</u>
<em />
<em>I hope this helps! Let me know if you have any questions :)</em>
![42 \times \pi = 131.94 \\ 131.94 \times 3 = 395.84](https://tex.z-dn.net/?f=42%20%5Ctimes%20%5Cpi%20%3D%20131.94%20%5C%5C%20131.94%20%5Ctimes%203%20%3D%20395.84)
the ferris wheel spins 395.84 feet a minute
![395.84 \times 5 = about \: 1978feet](https://tex.z-dn.net/?f=395.84%20%5Ctimes%205%20%3D%20about%20%5C%3A%201978feet)
the answer is 1978 feet