Lines s and t are perpendicular. if the slope of line s is -5, what is the slope of line ?
a: -1/5
b: 1/5
c: -5
d: 5

Solve the system of equations y= 3/2 - 1, -x+ y =-3

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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?