What angle is coterminal to 2pi/5 ? ?

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Student price tickets to a movie are $1 and non student tickets are $2. 350 tickets are sold and the total amount made is $450. how many non student tickets were sold ? a) 100 b) 150 c) 200 d)250

I'm confused on this could anyone me and show me what i need to do to solve it.