You can combine the terms with the same base

To simplify the expression (-10x^9)/(3x^13), you can combine the terms with the same base, x, by subtracting their exponents.

In this case, the x terms have exponents of 9 and 13. When dividing terms with the same base, you subtract the exponents, so we have:

-10/3 * (x^(-4)) = -10/3 * (1/(x^4))

Now, we have the simplified expression: