Evaluate the following expression when s = -7. 21-3s

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?