Zoe is going to the skateboard park with a group of friends. each ticket cost £8.50 each. tickets purchased in pairs cost £7.50 each. what is the least amount of money it will cost to buy 19?

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?