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$\frac{ {5}^{k} }{ {5}^{ - 4} } = {5}^{k + 4} \\ {( {5}^{k} )}^{ - 4} = {5}^{ - 4k} \\ \frac{ {2}^{ - 9} \times {2}^{ - 3} }{ {2}^{ - 7} } = {2}^{ - 5}$

$\frac{ {5}^{k} }{ {5}^{4} } = {5}^{k - 4} \\ \frac{ {3}^{ - 2} \times {3}^{ - 9} }{ {3}^{ - 8} } = {3}^{ - 3} \\ {125}^{n} = {5}^{3}$

10.

$\frac{ {( {c}^{ - 8} )}^{ - 6} }{ {c}^{ - 4} } = {c}^{52} \\ \frac{ {x}^{ - 4} }{ {x}^{6} \times {x}^{2} } = {x}^{ - 12}$