In one year about 478 billion telephone calls were placed by 145 million united states telephone subscribers. what was the average number of calls placed per subscriber?

false

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42

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)