Hamish uses 40 bricks per square metre of paving. He buys $500 worth of bricks. How many square metres of paving is he able to lay if bricks cost 80 cents each? (Answer to the nearest square metre).

Solve: 25 points find the fifth term of an increasing geometric progression if the first term is equal to 7−3 √5 and each term (starting with the second) is equal to the difference of the term following it and the term preceding it.