Answer:

Step-by-step explanation:

Rewrite the expression

Add

Therefore,
is equal to
.
I hope this helps!
Y-y
——-
X-x
21-9=12
5-(-1) =6
So the answer is D
Explanation. The given triangle is an equilateral triangle. Hence, all angles are equal to 60°. x = 180° – 60° = 120°.
I think it would be 70 cm