Final answer:
The correct option to simplify radical expressions is the Square root calculator. To simplify a radical expression, find the square root of the number inside the radical and multiply it by any coefficients or constants outside the radical.
Step-by-step explanation:
The correct option to simplify radical expressions is C) Square root calculator. The square root calculator allows you to calculate the square root of any number. To simplify a radical expression, you can use the square root calculator to find the square root of the number inside the radical, and then multiply it by any coefficients or constants outside the radical. For example, if you have √9x^2, you would simplify it to 3x, because the square root of 9 is 3 and x^2 remains the same.