Answer:
B. root(130)
Explanation:
we have to use the Pythagorean Theorem for this which is
Asquared + Bsquared = Csquared
where A and B are legs of the triangle separated by 45°, and C is the hypotenuse.
we want to find X which is where the hypotenuse is so we're just solving for C.
now we plug in all of the numbers we have into the formula.
7squared + 9squared = Csquared
49 + 81 = Csquared
130 = Csquared
now we take the square root from both sides to cancel out the square on the C.
root(130) = root(Csquared)
root(130) = C