Question

Can someone help me understand these?

Answer 1

Measure where X is with a ruler and put it in cm or inches

Answer 2

Hello,

As your title shows it, using Pythagorean's theorem:

x²+8²=10²
==> x²=100-64
==> x²=36
==> (x-6)(x+6)=0
==>x=6 or x=-6

x=6 since x must  be >0