Help pls !! thank you so much .

a = 12

Step-by-step explanation:

Pythagorean Theorem: a^2 + b^2 = c^2

a^2 + 9^2 = 15^2      >> solve the exponent

a^2 + 81 = 225         >> subtract both sides by 81

a^2 = 144                  >> square root

a = 12

step-by-step explanation:

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.