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Presenting your working out is extremely important because it's makes the examiners jobs easier, keeping them happy.One thing you should aim to do is not write too small, try and use all the space you're ...

P(WW) = 5/8 x 4/7 = 20/56

P(BB) = 3/8 x 2/7 = 6/56

P(same colour) = 20/56 + 6/56 = 26/56 = 13/28 (simplified)

AB = 4DB

AC = 2DB

Find BC using Pythagoras:

BC = √(4DB)² + (2DB)²

...

Step 1: 7k-21=3k-5

Step 2: 4k=16

Step 3: k=4

3x² +4x-12=0

Step 1: formula (-b+/- square root (b²-4ac))/2a

Step 2: a=3 b=4 c=-12

Step 3: type into your calculator 

Step ...