Simplify $$\(\quad a^{7} \times a^{4}\)$$ (1) (b) Simplify $$\(\quad w^{15} \div w^{3}\)$$ (1) (c) Simplify $$\(\quad\left(8 x^{5} y^{3}\right)^{2}\)$$ (2) (d) Make $$\(t\)$$ the subject of $$\(\quad c=t^{3}-8 v\)$$ (2)

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