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firstly we know how fast the wave is travelling and we know for how long so using our speed equals distance over time equation we can rearange for distance (D= VT). we can the plug in our speed(V) and our ti...

firstly the largest power is x^2 so when factorising we know that both brackets must involve an x plus or minus a number. next we look at the 21 and we need two numbers that multiply together to get this num...

This is your example problem: (m 4 ) 3 ​First of all remember what a single power means. So:m 4 = m x m x m x mThis must mean that:(m 4 ) 3 = m 4 x m 4 x m 4 ​ ​If you expand this out, how many m's will you ...

Adding decimal numbers is done exactly the same as normal numbers: the column method.When you have 2 decimal numbers to add together the most important thing is to line up the decimal points (dots) so that t...

Presenting your working out is extremely important because it's makes the examiners jobs easier, keeping them happy.One thing you should aim to do is not write too small, try and use all the space you're giv...