This week I learned how vertically opposite angles work.

This is a vertically opposite angle. These two diagonal lines intersect each other. Each line adds up to 180, meaning that when they intersect it adds to 360. At the top, we know that one angle is 140. Since the top is 140, we now know that the bottom is 140 as well. In order to find B, we can take 140 + 140 = 280 then subtract 365 from 280 which is 85. You must divide 85 by two in order to get both sides. You would end up getting 42.5 for B. to double check that the answers are correct, you can take all the numbers and add them all together to make sure they add up to 360.