Answer:
x = 70°
The external angle of a triangle is equal to the sum of the 2 opposite interior angles.
120° is an external angle of the triangle, thus
x + 50 = 120 ( subtract 50 from both sides )
x = 70
They slow down, because condensation causes them to bond together, forming a liquid.
Hope this helps!
D. All of the are important features of this model
