Evaluate the radical expression.

 Given:

Step1: Simplify the expression.

Step 2: Use the exponent rule (Power of the fraction ).

Step 3: 250 is divisible by 2.

Step 4: Cube root of 125 is 5. 
(Explanation: 125^1/3 means cube root of 125. so let's assume that some number is multiplied 3 times to get 125).