this question requires the Pythagorean theorem! the theorem states that a squared plus b squared is equal to c squared. c will always be the hypotenuse because it is the longest side. therefore we have to do the opposite and subtract in this case. therefore the equation would be 14 squared minus 9 squared is equal to b squared. solve this first and you get 115. you have to square root it to get the final answer. hope this helped! xoxo