Answer:
The answer is choice B: 22.52 units.
Step-by-step explanation:
We use the Pythagoras's theorem which says for a right triangle with sides [tex]x,y[/tex] and hypotenuse [tex]z[/tex]:
[tex]x^2+y^2=z^2.[/tex]
In our case
[tex]z=26[/tex]
[tex]y=13[/tex]
So we solve for [tex]x:[/tex]
[tex]x=\sqrt{z^2-y^2}=\sqrt{26^2-13^2} =\boxed{22.52\: units.}[/tex]
Which is choice B.
