Find x. round to the nearest degree.

When the three sides of a triangle is known and you are looking for one of the angles, you make use of the cosine formular which states that ; where A is the angle you are looking for (i.e. in this case x), a is the side opposite the angle you are looking for and b & c are the other sides of the triangle.
Therefore,

Idon’t know but you’ll figure it out