How do i solve this? number 11 -3(6) i have no idea

What is the measure of angle x? answer

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?

What number gives you a irrational number when added to 2/5