Answer:
13
Step-by-step explanation:
Y = 25 - 3x
X = 4
Y = 25 - 3(4)
Y = 25 - 12
Y = 13
The cent coin has a diameter of 0.75 in inches and 19.05 in millimeters, which both have a 5 in the hundredths place. The quarter coin has a diameter of <span>0.955 in inches, which again has a 5 in the hundredths place. </span>
The given system is
![\mleft\{\begin{aligned}2x+y=20 \\ 4x-2y=40\end{aligned}\mright.](https://tex.z-dn.net/?f=%5Cmleft%5C%7B%5Cbegin%7Baligned%7D2x%2By%3D20%20%5C%5C%204x-2y%3D40%5Cend%7Baligned%7D%5Cmright.)
To solve this, we multiply the first equation by 2, then we sum equations.
![\mleft\{\begin{aligned}4x+2y=40 \\ 4x-2y=40\end{aligned}\mright.\rightarrow8x=80](https://tex.z-dn.net/?f=%5Cmleft%5C%7B%5Cbegin%7Baligned%7D4x%2B2y%3D40%20%5C%5C%204x-2y%3D40%5Cend%7Baligned%7D%5Cmright.%5Crightarrow8x%3D80)
Then, we divide the equation by 8.
![\begin{gathered} \frac{8x}{8}=\frac{80}{8} \\ x=10 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20%5Cfrac%7B8x%7D%7B8%7D%3D%5Cfrac%7B80%7D%7B8%7D%20%5C%5C%20x%3D10%20%5Cend%7Bgathered%7D)
Now, we use this value to find <em>y</em>.
![\begin{gathered} 2x+y=20 \\ 2(10)+y=20 \\ 20+y=20 \\ y=20-20 \\ y=0 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%202x%2By%3D20%20%5C%5C%202%2810%29%2By%3D20%20%5C%5C%2020%2By%3D20%20%5C%5C%20y%3D20-20%20%5C%5C%20y%3D0%20%5Cend%7Bgathered%7D)
<h2>Therefore, the solution to the system is (10, 0).</h2>
This is very particular chancery do I don’t know what to do I don’t know what hold on plus X +6 equals X +10+10 whoops I didn’t mean to send this
Answer:
10.8
Step-by-step explanation:
To find 20% of 54, we need to multiply 0.20 (the decimal form of 20%) by 54.
54 · 0.20 = 10.8
So, 20% of 54 is 10.8.
Hope this was helpful! Let me know if you have any other questions. :)