The following is a list of 13 measurements. 16, −31, 49, −70, −41, 75, 98, 4, −59, 11, −49, −5, −52

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Suppose that these 13 measurements are respectively labeled x1, x2, ..., x13. (Thus, 16 is labeled x1, −31 is labeled x2, and so on.) Compute the following.
Σ=i1134xi

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.