Help please and help me understand how to solve

Step-by-step explanation:

You have a right triangle here.  The way to solve for a missing side in a right triangle is to use Pythagorean's Theorem.  You can't use right triangle trig because you don't have an angle. Pythagorean's Theorem is, in this case,

and

and

so

which simplifies down to

x + 4/7

step-by-step explanation:

use cymath