If $2^{k+1} = 2 \cdot 2^k$ what does $2^{k-1}$ equal?

Yes, you are thinking in the correct direction. Also this is true (a, b, c, m are taken real numbers and a is not equal to zero.)

$$a^{b.c-m}=\frac{a^{b.c}}{a^m}$$

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Exponentiation

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