Given:
[tex]\text{ y}^{-10}[/tex]Let's again recall the rule: The negative exponent in the numerator rule tells us that a number with a negative exponent should be put to the denominator, and vice versa.
In other worths, if the exponent of a number or variable is negative, we should reciprocate it and remove the negative sign.
We get,
[tex]\text{ y}^{-10}\text{ = }\frac{1}{y^{10}}[/tex]Therefore, the answer is:
[tex]\text{ }\frac{1}{y^{10}}[/tex]