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Running through plan of how to tackle question. 10 marker question from middle of paper (roughly allocate 20 minutes to this). Letter requires - Correct salutation i.e. Dear Sir/Madam. Yours faithfully. Date...

Positive and negative ions attract one another and bind together forming a new substance. This is called ionic bonding . It is usually between a positive metal ion which is going to donate ions to a negative...

So economies of scale is an economic theory which explains why large firms tend to have cheaper per unit costs than smaller companies. The theory basis its ideas around a few key issues. There are many ways ...

Rearranging equations to find x. The first thing to do is to look at the 3. To 'get rid' of the 3 from the left we need to minus 3. Remember we must do the same to both sides so we also minus 3 from the righ...

The idea for this is simply counting the number of possibilities of each digit. Since the number is a multiple of 5, then we must have it finishing with 0 or 5, i.e., we have 2 possibilities for the last dig...