Answer:
The answer is 5.
Step-by-step explanation:
Using pythagoras theorem:-
[tex]13^{2}[/tex] = [tex]x^{2}[/tex] + [tex]12^{2}[/tex]
=> [tex]13^{2}[/tex] - [tex]12^{2}[/tex] = [tex]x^{2}[/tex]
=> [tex]x^{2}[/tex] = 25
=> [tex]x[/tex] = [tex]\sqrt{25}[/tex]
∴ [tex]x[/tex] = 5
