Answer:
7.8
Step-by-step explanation:
We can use pythagorean theorem [tex](a^2+b^2=c^2)[/tex] where a and b are sides of a right triangle and c is the hypotenuse.
[tex]x^2+13.3^2=15.4^2[/tex].
[tex]x^2=15.4^2-13.3^2\\[/tex]
[tex]x^2=237.16-176.89\\x^2=60.27\\x=7.763[/tex]
Rounded to the nearest tenth, x = 7.8
