According to the us census bureau 3/5 of all adults in the united states visited a zoo in 2007 what percent of all adults in the united states visited a zoo in 2007

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2x minus y equals 6, x plus y equals negative 3

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.