You are buying balloons for a party. a small balloon costs $2. a large balloon costs $3. write an algebraic expression for the cost of x small balloons and y large balloons. then find the total cost for 11 small balloons and 5 large balloons.

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.