Question 2:
![9K-2K+5+7=](https://img.qammunity.org/2023/formulas/mathematics/high-school/pf4fapjb4etlvcqm0tf672zdf2ze6akte5.png)
Let us simplify the above expression
The terms are already combined so we just need to simplify them
![\begin{gathered} 9K-2K+5+7 \\ 7K+5+7 \\ 7K+12 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/gsvc4a0xkry3yjh3u14hfcusrqdc7akltl.png)
Question 3:
![3-5y+6=](https://img.qammunity.org/2023/formulas/mathematics/high-school/7gp2covrqmppr998qqur9d9i9e74q6ewmg.png)
Let us simplify the above expression
Combine the like terms together and simplify
![\begin{gathered} 3-5y+6 \\ 3+6-5y \\ 9-5y \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/weqa6h0e945i4zuhz5azupzrmj1fgprr51.png)
Question 4:
![7r-r=](https://img.qammunity.org/2023/formulas/mathematics/high-school/w2cgk8zybcxrlcbqsjiwu9wc9598sqfaiz.png)
Let us simplify the above expression
Simply subtract r from 7r
![\begin{gathered} 7r-r \\ 6r \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/wtjbquoc9yiw4npnq9v4mhsazl6npiass8.png)
Therefore, the simplified expressions are
![\begin{gathered} 2.\: \: 9K-2K+5+7=7K+12 \\ 3.\: \: 3-5y+6=9-5y \\ 4.\: \: 7r-r=6r \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/vhgr8cj2knbv4ogf11pcq317prlt7whxcu.png)