To find x, we can use the Pythagorean theorem, where a and b are the legs of the right triangle and c is the hypotenuse (a^2+b^2=c^2). Plug in the legs of the triangle for a and b, and solve.
6^2+8^2=c^2
36+64= c^2
100 = c^2
Square root of 100 = c
10 = c.
The hypotenuse or x is 10 units. Hope this helps.