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With equations, e.g. 4x = 12, the 4x variable has a given value. This means you can apply the same changes to both sides (at the same time). For example, both sides can be divided by 4 to give x=3
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When it comes to solving simultaneous equations the way you structure your working out will really help you get to the correct answer. The layout can be used for all simultaneous equations and will make e...

To solve this equation for x we must first make sure there is a common denominator across the whole equation. In this case as 2 and 3 are both factors of 12, meaning 12 can be divided by them to generate ...

The perimeter of the rectangle can be found using 3x+6+3x+6+2x-5+2x-5=10x+2We know from the question the perimeter equals 22cm.10x+2=22We can subtract 2 from both sides10x=20Divide through by 10 and we ge...

we would draw a tree diagram to show this.
4 consecutive days means everyday except friday, or everyday except monday.
this would be 2(0.3x0.3x0.3x0.3x0.7)