Theo solved n + 5 = 11 for the unknown. The steps he
took are shown.
He started with 5 tiles.
Then he added tiles as he counted up to 11.
He realized he added 6 more tiles to his original 5 to make
11. So he found the unknown to be 6.

what is the question?

Step-by-step explanation:

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°