Respuesta :

Angles on a straight line add up to 180°.
Therefore:

2m + 10 + 5 m + 100 = 180

7m + 110 = 180

7m = 180 - 110

7m = 70

7m ÷ 7 = 70 ÷ 7

m = 10

m=10 i just submitted it and it was right