Answer:
try asking a master, ok?
Step-by-step explanation:
✨Vines vines vines vines vines vines vines✨
4.
![\sqrt{64}=8\\\\8\dfrac17=8.14285714...\\\\8.\overline{14}=8.14141414...\\\\ \dfrac{15}2=7,5\\\\\\ \boxed{\ \dfrac{15}2\ \ \textless \ \ \sqrt{64}\ \ \textless \ \ 8.\overline{14}\ \ \textless \ \ 8\dfrac17\ }](https://tex.z-dn.net/?f=%5Csqrt%7B64%7D%3D8%5C%5C%5C%5C8%5Cdfrac17%3D8.14285714...%5C%5C%5C%5C8.%5Coverline%7B14%7D%3D8.14141414...%5C%5C%5C%5C%20%5Cdfrac%7B15%7D2%3D7%2C5%5C%5C%5C%5C%5C%5C%20%5Cboxed%7B%5C%20%5Cdfrac%7B15%7D2%5C%20%5C%20%5Ctextless%20%5C%20%5C%20%5Csqrt%7B64%7D%5C%20%5C%20%5Ctextless%20%5C%20%5C%208.%5Coverline%7B14%7D%5C%20%5C%20%5Ctextless%20%5C%20%5C%208%5Cdfrac17%5C%20%7D)
5.
![\sqrt{18}](https://tex.z-dn.net/?f=%20%5Csqrt%7B18%7D%20)
doesn't belong with the other three because it is irrational number
The other three can be expressed as a ratio between two <span>integers.
![-\dfrac{10}2=\dfrac{-10\ }2\\\\-13.4=-13\frac4{10}=\frac{-134}{\ 10}\\\\ 22.\overline7=22\frac79=\frac{205}9\\\\\\ \sqrt{18}=\sqrt{9\cdot2}=\sqrt9\cdot\sqrt2=3\sqrt2](https://tex.z-dn.net/?f=-%5Cdfrac%7B10%7D2%3D%5Cdfrac%7B-10%5C%20%7D2%5C%5C%5C%5C-13.4%3D-13%5Cfrac4%7B10%7D%3D%5Cfrac%7B-134%7D%7B%5C%2010%7D%5C%5C%5C%5C%2022.%5Coverline7%3D22%5Cfrac79%3D%5Cfrac%7B205%7D9%5C%5C%5C%5C%5C%5C%20%5Csqrt%7B18%7D%3D%5Csqrt%7B9%5Ccdot2%7D%3D%5Csqrt9%5Ccdot%5Csqrt2%3D3%5Csqrt2)
</span>
Answer: ![A^{-1}=\left[\begin{array}{cc}\frac{3}{2}&-\frac{1}{2}\\-2&1\end{array}\right]](https://tex.z-dn.net/?f=A%5E%7B-1%7D%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D%5Cfrac%7B3%7D%7B2%7D%26-%5Cfrac%7B1%7D%7B2%7D%5C%5C-2%261%5Cend%7Barray%7D%5Cright%5D)
<u>Step-by-step explanation:</u>
![\left[\begin{array}{cc}2&1\\4&3\end{array}\right]=\left[\begin{array}{cc}1&0\\0&1\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D2%261%5C%5C4%263%5Cend%7Barray%7D%5Cright%5D%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D1%260%5C%5C0%261%5Cend%7Barray%7D%5Cright%5D)
![\dfrac{1}{2}Row\ 1\rightarrow\left[\begin{array}{cc}1&\frac{1}{2}\\4&3\end{array}\right]=\left[\begin{array}{cc}\frac{1}{2}&0\\0&1\end{array}\right]](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B2%7DRow%5C%201%5Crightarrow%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D1%26%5Cfrac%7B1%7D%7B2%7D%5C%5C4%263%5Cend%7Barray%7D%5Cright%5D%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D%5Cfrac%7B1%7D%7B2%7D%260%5C%5C0%261%5Cend%7Barray%7D%5Cright%5D)
![Row\ 2 -4 \ Row\ 1\rightarrow \left[\begin{array}{cc}1&\frac{1}{2}\\0&1\end{array}\right]=\left[\begin{array}{cc}\frac{1}{2}&0\\-2&1\end{array}\right]](https://tex.z-dn.net/?f=Row%5C%202%20-4%20%5C%20Row%5C%201%5Crightarrow%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D1%26%5Cfrac%7B1%7D%7B2%7D%5C%5C0%261%5Cend%7Barray%7D%5Cright%5D%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D%5Cfrac%7B1%7D%7B2%7D%260%5C%5C-2%261%5Cend%7Barray%7D%5Cright%5D)
![Row\ 1-\dfrac{1}{2}\ Row\ 2 \rightarrow \left[\begin{array}{cc}1&0\\0&1\end{array}\right]=\left[\begin{array}{cc}\frac{3}{2}&-\frac{1}{2}\\-2&1\end{array}\right]](https://tex.z-dn.net/?f=Row%5C%201-%5Cdfrac%7B1%7D%7B2%7D%5C%20Row%5C%202%20%5Crightarrow%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D1%260%5C%5C0%261%5Cend%7Barray%7D%5Cright%5D%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D%5Cfrac%7B3%7D%7B2%7D%26-%5Cfrac%7B1%7D%7B2%7D%5C%5C-2%261%5Cend%7Barray%7D%5Cright%5D)
This equation if finding x would be 88