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When light passes through a narrow gap it will diffract (spread out). This means the light reaching the screen could have come from anywhere w...

These two simple acronyms will help you remember the effects of changes in the exchange rate on imports and exports:

Strong
Pound
Imports
Cheap
Exports
Dear<...

There are several important differences betwe...

Surds are numbers left in 'square r...

y=6x-2

x²-4x+19

Both equations are equal to Y, hence can be substituted into each other;

6x-2= x^2-4x+19

Now we only have X terms in our equations

Br...