EASY MATH QUESTION HELP! Under the Angle Addition Postulate, which equation would be valid?

What is true about angles 2 and 7 in the picture below?

EASY MATH QUESTION HELP Under the Angle Addition Postulate which equation would be valid What is true about angles 2 and 7 in the picture below class=
EASY MATH QUESTION HELP Under the Angle Addition Postulate which equation would be valid What is true about angles 2 and 7 in the picture below class=