Ellen's classes are 55 minutes each with 10-minute passing periods. If she has 4 classes before lunch break, and there is no passing period before first period or
immediately before lunch, approximately how many hours before lunch do her classes
start?

Use sigma notation to represent the following series for 9 terms.

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.

What is the point slope form of a line with slope -5 that contains point (2,-1)