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The written sources are the main historical source that historian use in their research. However the answers they provide will very much depend on the sorts of questions historians are asking. Before w...

This was a question I was commonly asked when assisting GCSE science students in year 9/10. 

Breathing is simply taking air in through your nose/ mouth and down into lungs (and then breat...

P(2 orange sweets) = P(orange sweet) * P(orange sweet)

(6/n) * (5/(n-1)) = 1/3

30/(n(n-1)) = 1/3

90 = n(n-1)

90 = n²-n

n...