Do (4+9)+5 = (9+4)+5 and (4+9)+5 = (4+9)+5 illustrate the same property? justify your response.

yes

Step-by-step explanation:

changing the order of an adding equation does not change the sum.

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°

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