book Maths Puzzle Numerical Ability

7n(n)(n)(n)(n)+7n(n)(n)(n)-3n(n)-6n-3

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book Other Question

Graph the following linear equations and advise points:
3x-2y=12
and
y=2x+5

thanks! The combined ages of Mary and Ann are 44 years. Mary is twice as old as Ann. When Mary was half as old as Ann will be when Ann is three times as old as Mary, when Mary was three ti