The difference of twice a number and 8 is at most 18

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

Which best explains why this triangle is or is not a right triangle ?

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