If you use the Pythagorean Theorem, you'll see that x^2 + 5^2 = 8^2. That'll simplify down to
x^2 + 25 = 64. Then you subtract 25 from 64 and that'll give you 39. You then have to find what √39 is and that is 6.244, so that is 6.0 simplified to the nearest tenth.
