Mai poured 2.6 liters of water into a partially filled pitcher. the pitcher then contained 10.4 liters.

There was originally 7.8 liters of water in the pitcher

Im not sure what the question here is.

But if we take 10.4-2.6 we get 7.8

Initially there was 7.8 liters in the pitcher.

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on friday there were 15 birds

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°