Answer:
![\sqrt[3]{-0.064}=-0.4](https://img.qammunity.org/2020/formulas/mathematics/high-school/8qterw5y92sjay4gc9y0opsiusjqxf3k5j.png)
Explanation:
An on-line calculator can do this if your own doesn't.
For a cube root, you may have to use the exponentiation function with an exponent of 1/3. Usually, that fraction will need to be put in parentheses. (See the second attachment for the result from a TI-84 calculator.)