Is the following relation a function?
{(4, 5), (5, 6), (4,3), (7, 8)}

Iwill give you ! what is the measure of ∠v ?

Could somebody me with this radical simplification?

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?