What is b? i need answering this question.

Hi! 

The line that the 36 degree angle rests on is a straight angle, meaning that it measures 180 degrees. This straight angle is split up into two separate angles. Since we already know one of the angle measures we can do some simple subtraction to get the angle measurement for angle b. 

180-36=144

So angle b measures 144 degrees. 

Hope this helps :)

Just copying this over just in case others with similar questions turn this up in search results rather than the other, haha!
When you multiply or divide a negative by another negative, you get a positive. When it is a negative and a positive, it remains negative.
Assuming your question simplified into a equation (or number form? Been a while, haha!) is 32÷-2÷(-16÷4), it would end as a positive. Because you first divide the positive 32 by a negative 2, you get a negative. Because -16÷4 is in parenthesis, it is done because following the rest of the equation (P.E.M.D.A.S.!), it would be 32÷-2÷-4. Going from left to right, as you should, it results in a negative being divided by another negative, so you get a positive. 32÷-2÷(-16÷4) = 32÷-2÷-4 = -16÷-4 = 2!