help me pls i really need help

9514 1404 393
Answer:
9.38
Step-by-step explanation:
For a right triangle, the Pythagorean theorem tells you the relationship between the leg lengths and the hypotenuse is ...
x² +9² = 13²
x² = 169 -81 = 88
x = √88 ≈ 9.38
The length of x is about 9.38 units.