Answer:
1
Explanation:
The multiplicative inverse of a number is just that number raised to the -1. For 9, that would be 9⁻¹, or 1/9. If you multiply those together, you just get 1.
![9*9^-^1=(9)/(1)*(1)/(9)=(9)/(9)=1](https://img.qammunity.org/2023/formulas/mathematics/high-school/3l3og43lomun5zy06voouwi4hi5610x8q5.png)
That is true for any number, anything multiplied by its multiplicative inverse will always be 1.
![a* a^-^1=(a)/(1)*(1)/(a)=(a)/(a)=1](https://img.qammunity.org/2023/formulas/mathematics/high-school/j4exa29ru15p3muaxosf9jkna35he6ec1d.png)