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Simplify the following expressions:
(a)
$$ a^7 \times a^8 $$(b)
$$ 7b^9 + 8b^9 $$(c)
$$ (2c)^5 \times c^{-3} $$(d)
$$ (d^4 e^3) \div (d^{-1} e^3) $$Show that 206 can be written as the sum of a power of five and a square number.
\(y = a \times b^{x – 2}\) where \(a\) and \(b\) are numbers.
\(y = 5\) when \(x = 2\)
\(y = 0.005\) when \(x = 5\)
Work out the value of \(y\) when \(x = 4\)
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