An unknown number x is at most 30. Which graph best represents all the values of x? (1 point) Group of answer choices Number line graph with closed circle on 30 and shading to the right. Number line graph with closed circle on 30 and shading to the left. Number line graph with open circle on 30 and shading to the left. Number line graph with open circle on 30 and shading to the right

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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°