Determined the unknown addend

Step-by-step explanation:

What you would need to do is take 9+14, and you would get 23, and you would want to change that to be negative, so you would get a negative answer. So now when you plug the -23 into the empty space it is -23+ 14= -9

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.