Answer:
x = 15in
Step-by-step explanation:
We can use the Pythagorean theorem to solve since this is a right triangle
a^2 + b^2 = c^2 where a and b are the legs and c is the hypotenuse
9^2 + 12^2 = x^2
81 +144= x^2
225 = x^2
Take the square root of each side
sqrt(225) = sqrt(x^2)
15 =x
