Answer:
[tex]3\sqrt{34}[/tex]
Step-by-step explanation:
You use the Pythagorean theory A^2+B^2=C^2 (C being the hypotenuse)
So... 9^2+15^2 = 306. Then, you need to take the root of 306. This is [tex]3\sqrt{34}[/tex] or 17.49285568...
Hope this helps!
