Answer:
All options are correct.
Explanation:
We have to find the expression which are in the simplest form.
A.
![x^(-3)+y^3](https://img.qammunity.org/2022/formulas/mathematics/high-school/4a2sqsrzh7mskfa275oj4bh8eibc2cflxz.png)
The expression cannot solve further.
Therefore, the given expression is in the simplest form .
B.
![(1)/(x^4)](https://img.qammunity.org/2022/formulas/mathematics/high-school/ljlcakjupvxj2q47zy9wfm433bgfxhxcbl.png)
The expression cannot solve further.
The given expression is in the simplest form.
C.
![(w^7)/(x^2)](https://img.qammunity.org/2022/formulas/mathematics/high-school/b3reg8w40m3qjtempbvynizrx9iqgu88gl.png)
cannot divide
.
The expression cannot solve further.
Hence, the given expression is in the simplest form.
D.
![a^(-9)](https://img.qammunity.org/2022/formulas/mathematics/high-school/ofhukpouabglnulmpy3zqb2nsilk6rpzp5.png)
The expression cannot solve further.
The given expression is in the simplest form.
E.
![(1)/(a^2)+b^2](https://img.qammunity.org/2022/formulas/mathematics/high-school/qc4zdlfsucnnqt3lv48jwci7stiq04vinj.png)
The expression cannot solve further.
Hence, the given expression is in the simplest form.
F.
![(1)/(b^5)](https://img.qammunity.org/2022/formulas/mathematics/high-school/6i53523y28tss2h7lqbpshs6k2h032j3g7.png)
The expression cannot solve further.
Hence, the given expression is in the simplest form.
Hence, all options are true.