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The moles is the amount of a substance that we are measuring, its like measuring how many coins I have in my pocket, but instead how many atoms of an element we have.  We use the equation moles=mass/RMM t...

Firstly, since only one equation is linear, substitution must be used. This will allow us to make a quadratic equation with one variable and solve for X and Y. To do this, I will make Y the subject of the...

Original Price x Percentage Multiplier = New Price

Percentage Multiplier = (100-20)/100 = 0.8

OP x 0.8 = £12

OP = £12/0.8 = £15

Each element has a unique number of protons. For example, every carbon atom contains 12 protons. The number of neutrons can differ for each "form" of the same element - this is known as an isoto...

First, split into prime factors- 96= 2^5 * 3 and 132= 2^2 * 3 * 11 Whilst very similar to highest common factor, lowest common multiple is found by comparing the two sets of prime factors, and for each pr...