Step-by-step explanation: You're given two angles 48 degrees and 41 degrees and the unknown is X in this instance. So you want to add the two given angles 48 + 41 = 89. Rewrite algebraically or simple form. X + 89 = 180 so subtract 89 from both sides. Eliminating 89. 180 - 89 = 91 so X = 91 degrees. A triangle is equal to 180 degrees.
You'd multiply the amount of string for each balloon (12 feet) by the 54 balloons he needs, and you get 648 feet. There are 3 feet in a yard so then you would divide 648 by 3 and get 216 yards
