Two coworkers picked up some writing instruments at the office supply store. Percy selected 3 boxes of pencils and 10 boxes of ballpoint pens, paying $36. Next, Nick spent $16 on 5
boxes of pencils and 2 boxes of ballpoint pens. How much does a box of each cost?
hel

c is the correct answer

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)

jbankston is right, use thhe link and you should find the answer.