Tan x= sin x/cos x. therefore, tan (90-a)°= ? (all angle measurements are in degrees)
a.) 1/tan(90-a)
b.) 1/sin a
c.) 1/cos(90-a)
d.) 1/tan a

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?