You have the following expression:
[tex]\sqrt[3]{1000}[/tex]In order to simplify the previous expression, consider that number 1000 can be written as 1000 = 10³.
Furthermore, consider that ³√ of a number can be written as the same number powered to 1/3.
Then, you have:
[tex]\sqrt[3]{10^3}=(10^3)^{\frac{1}{3}}=10^{\frac{3}{3}}=10[/tex]Hence, the simplied expression is 10