How many triangles can be formed

What is the pattern in the values as the exponents increase?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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?