In this equation x equals the number that came previously in the sequence.
The equation you need is ½x. That is the term to term for this question.
Answer:

Step-by-step explanation:

♨Rage♨
The bases of triangles are paralleles, so the angles are the same, the sum og the interior angles are always 180° in a triangle, so 180 - 55 -60 = 65°
x = 65°
y = 60°
z = 55°