Please help song for b​

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

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

The longer leg of a 30-60-90 trangle is 18