In a sample of 77 children, the mean age at which they first began to combine words was 16.5 months, with a sample standard deviation of 9.6 months. Compute a 90% confidence interval for the mean age at which children first begin to combine words.

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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