Are you asking about finding the degree of B? If you are the answer I believe would be 119.9° If you think about it, the total degrees of a triangle is 180° so you would subtract the the degrees of both A and C from 180° and get 119.9°. Sorry if that’s not what you were asking for.
A number that has a negative sign in front of it, opposite from positive numbers, and below zero are all phrases that can describe negative numbers. Hope this helps.