R- 17.1 = -4.8 show work. i kinda get how to do these problems but i don’t understand how the answer is 12.3. i got 34.2

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.

8) during a clearance sale, a keyboard that normally sells for $49.99 is discounted for $34.99. what is the percent discount?

The parker family drove a total of 180 miles on their road trip. this distance is 1.5 times the distance they drove on the first day. how many miles did the parker family drive on the first day?