What is the factorization of 81a^6-100?

Pls! does anybody know a shortcut for answering these types of questions in the future?

How do i get my dad to stop making me gargle his pickle i want my mom to gargle my pickle not my dads

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?