Expand $$\(x(5-x)\)$$ (1) (b) Factorise $$\(3 y-21\)$$ (1) (c) Make $$\(p\)$$ the subject of the formula $$\(f=3 p-d\)$$ (2) Sergio buys $$\(m\)$$ boxes of seeds and $$\(n\)$$ packets of seeds. Each box contains 10 seeds. Each packet contains 6 seeds. The total number of seeds that Sergio buys is $$\(T\)$$. (d) Write down a formula for $$\(T\)$$ in terms of $$\(m\)$$ and $$\(n\)$$. (3)

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