Can you help me please, Thanks!

b

Step-by-step explanation:

i think it might be 4 hope it helps

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)

the answer to this in exact form is 4/35 but in decimal form its 0.1142857

hope this if needed hmu