C sqrt [3](120+sqrt (28-sqrt {7+sqrt {4))}=

To solve this expression, we need to simplify the innermost square root first. The innermost square root is , which is equal to 2. Next, we have , which simplifies to , or . The square root of 9 is 3. Now, we have , which simplifies to , or . The square root of 25 is 5. Finally, we have , which simplifies to , or . The cube root of 125 is 5. Therefore, the value of the given expression is 5.