Use Pythagorean Theorem which states that in a right triangle:
[tex]a^2+b^2=c^2[/tex], where a and b are the legs, and c is the hypotenuse.
[tex]24^2+10^2=x^2[/tex]
Take the square root of both sides to solve for x.
[tex]x = \sqrt{676} = 26 [/tex]
The answer is 26.