Yoko purchased a prepaid card for $20. Long distance calls cost 6 cents a minute using this card. Yoko used her card only once to make a long distance call if the remaining credit on her card is $17.84, how many minutes did her call last

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.