Answer:
Step-by-step explanation:
a^2 + b^2 = c^2
7^2 + b^2 = 13^2
b = square root of 120
x=5sq rt 6 or 12.25
(5sq rt 13)^2=x^2+(5sq rt 7)^2
325=x^2+175
x^2=150
