Can someone plz simplify this and explain

Giving ad is congruent to bc and angle bcd is congruent to angle adc prove d e is going to ce

Complete this sentence with the best of choices given

The 7th grade has collected $200 for a field trip that would cost $600. the teachers decided to ask $50 from additional students to cover the cost. how mny students must pay to cover the cost ? a 16studentsb 80studentsc 160studentsd 8students show work