Me! i went through the lessons and i couldn't quite comprehend what my teacher was trying to teach

If you think of a clock face:

the line shown is negative because one end is between 9 and 12 on the clock and the other end is between 3 and 6 on the clock.

Positive would be the opposite - one end between 12 and 3, the other 6 & 9.

O would be a straight line horizontal or perpendicular to the x axis.

here

step-by-step explanation:

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .