What is the difference between -131 and -87 on a number line

44 because the absolute values are 131 and 87 and to find difference you subtract.

127

whether it's diameter, or radius, i believe if i remember correctly from school, every amount has to always add up to 180. so if you take 53, and starting adding, long story short, taking 127 and adding it to 53, gives you 180.