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BODMAS is an acronym that tells you what order to do things in a maths equation. It stands for brackets, order (e.g. 2²), division/multiplication and addition/subtraction. 

Semi-Colons are a piece of punctuation which many people do not know how to use properly. Used correctly, semi-colons can show an examiner that you are capable of using advanced punctuation and can help y...

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

Firstly the values should be converted into more comfortable units. 0.42km/s = 420m/s, and 16kHz = 16,000Hz. Next, use the equation wavelength = speed/frequency This gives wavelength = 420m/s over 16,000/...