Simplify $$\(\left(2 e^{2} f^{3}\right)^{3}\)$$ (2) (b) Expand and simplify $$\((3 x-4 y)(x+3 y)\)$$ (2) $$\(\frac{\sqrt{a} \times a}{a^{-2}}\)$$ can be written in the form $$\(a^{k}\)$$ (c) Find the value of $$\(k\)$$. $$\[ k= \]$$ (2) (d) Simplify $$\(\frac{2^{n}-1}{4^{n}-1}\)$$ (2)

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