20 That is my mystery number???
My number has 3 digits
It is less than 130
It is greater than 110
It is even
The sum of its digits is ?
hat could my mystery number be???

126

Step-by-step explanation:

126 fits all the criteria

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°