HELP!! How can you prove that a line parallel to one side of a triangle divides the other 2 sides proportionally?

Let w=23 . what is the value of w + 45 ?

According to the number line, what is the distance between points a and b? v ++ + + + + -16 -14 -12 -10 -8 + 6 + 4 + -2 + 0 + 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 o6 units o 7 units 12 units o 14 units

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i