Select 222 strategies that we can use to subtract 977-149977−149977, minus, 149

a - base

b - exponent

so,

hard

step-by-step explanation:

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 is 15 to your question