Simplify $$\(6 m-2 k+5 m-k\)$$ (2) $$\(P=2 a+3 b\)$$ (b) Work out the value of $$\(P\)$$ when $$\(a=5\)$$ and $$\(b=8\)$$ $$\[ P= \]$$ (2) $$\(P=2 a+3 b\)$$ (c) Work out the value of $$\(a\)$$ when $$\(P=16\)$$ and $$\(b=20\)$$ $$\[ a= \]$$ (3)

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