A girl has scores of 80, 76, 74, and 79 on her algebra tests. a. Use an inequality to find the score she must make on the final exam to pass the course with an average of 75 or higher, given that the final exam counts as three tests.
b. Explain the meaning of the answer to part a.

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.