7. The folding chair has different settings that change the angles formed by its parts. Suppose m<2 is 31 and m<3 is 72. Find m<1. the diagram is not to scale.
A. 123
B. 113
C. 93
D. 103
I need an answer plus an explanation so I understand this correctly.. And please don't answer if you don't know. If it's not an answer then please don't answer at all.
