Please help me with this question

m < ABC is "The measure of angle ABC"

Step-by-step explanation:

The m < ABC denotes that it is the measure of the angle, < ABC.  

The letter in the middle of the angle’s name has to be the point of the angle’s vertex. We know from the name <ABC that point B is the vertex of the angle in question. Since B is the vertex, any other name we could give to that same angle would have to stay true to which point is the angle’s vertex, meaning that B would have to be in the middle of the angle’s name.

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the anwser is d) 75°

step-by-step explanation:

a is 8.b is 10.c is 10.5. d is -.5

step-by-step explanation:

just minus the smallest number from the biggest.