Dannys cell phone plan costs $39 per month. Text messages cost an additional $0.15 each. if dannys cell phone bill last month totaled $55.05, write and solve an equation to determine how many text messages he sent.

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.