The solution to the equation $x^3 = 64$ is called the cube root of $64$. The idea is similar to the idea of a square root, except that the value must be cubed (multiplied by itself three times) to become $64$. One way to write the cube root of $64$ is using the notation $\sqrt [ 3 ] { 64 }$. Use this information to evaluate each of the following expressions.