How would I write a square root symbol

On word you have to go to "symbols" and select the square root symbol.

Or you can just copy this: √

Hope this helps! :]

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.