Answer:
<h2>B</h2>
Step-by-step explanation:
They give it in plain words.

And as the d is used once and not as a exponent, we can consider this as a variable.
n=12
5/6n= 10
multiply both sides by 6.
5/6(6) n= 10(6)
5n=60
divide both sides by five and then you get 12.
The answer is d.
The parallelogram is 2 times the height of the triangle.
ANSWER
12
EXPLANATION
Two expressions for the angles in terms of x are given,
The first one is (10x-20)°
The second one is (6x+8)°
The two angles are angles on a straight line.
The sum of angles on a straight line is 180°.
This implies that,

Group similar terms,

Combine like terms:


Therefore the value of x is 12