It means that something is made up of several smaller things.
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It means the radius squared.
Term to Term rule in Maths is how much you go up or down in. e.g 1,2,3,4,5,6 would be +1
It means that you need to work much harder.
You mean 9x2? Well that is 18!
Compound inequalities is when there is two inequality signs. You will regularly graph compound inequalities on a number line.