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Relative atomic mass is the mass of one atom of an element compared to 1/12 of the mass of an atom of carbon-12.

The most significant difference between GCSE and A-level history is the amount of emphasis markers place on analysis, interpretation and evaluation. For example, if we use the question “To what extent was...

3/12, 2/8. To identify fractions which are equivalent to one another, you need to identify the common multiple of both the denominator and numerator and then simplify. When a fraction is equivalent to one...

first equation: 6a + b = 16     second equation: 5a - 2b = 19    from 2 times first equation + second equation 17a = 51 meaning a = 3

.... from the first equation 6(3) + b = 16 therefore b = - 2

b) when the anchor is in the lake it displaces the amount of water equivallent to the volume of the anchor, when the anchor is in the boat it displaces the amount of water equivallent to the anchors mass....