Answer:
<h3>C. 113°</h3>
Step-by-step explanation:
(7x - 1) + 79° = 21x + 8
• An exterior angle of a triangle is equal to the sum of its two interior opposite angles.
NRS = 21x + 8
Y is equal to 54. (B)
A triangle has a total degree of 180. Given that two of the angles are the same and the last angle is 72 degrees, you can subtract 72 from 180 to get 108. From there, You can divide 108 by 2 (because there are two equal parts) to get 54.
This is really easy!! Just tape it on a calculatrice and you see will!’ Good luck !!