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a² = 3² = 9, b² = 4² = 16, a² + b² = 3² + 4² = 25, c² = 25, c = 5

Estimate, so: 900 litres, and 20 litres per day. 900/20 = 45 However, any estimation that results in an answer between 44-56 is acceptable.

• multiply everything by 5, so you get 6y - 30 = 10x + 12 - add 30 to both sides, so you get 6y = 10x + 42 - divide everything by 6, so you have y = (10/6)x + (42/6) - simplify, y= (5/3)x + 7 - this i...

First of all we want to expand the brackets out. We do this by mulitplying 4 by each number in the bracket. This then gives us 14-x = 4+4x. We then want to get all the x's on one side and the numbers on t...

To expand brackets you should multiply each term with every other term. Here it would be: 3a²-3a+4a-4 Collecting the a terms, this simplifies to: 3a²+a-4.