Question

Find the value of x.

A.18
B.15
C.16
D.19

PLEASE HELP!!!!!

Answer 1

x = 19

Explanation:

123°+3x = 180°

3x = 180°-123°

3x = 57

x = 57/3

x = 19

The reason why we use 123° + 3x = 180° because both are adjacent angles. Adjacent angles add up to 180°