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Rewrite the following expressions with positive exponents

A)
[tex]y {}^{ - 6} [/tex]
B)
[tex]7c {}^{ - 4} [/tex]
C)
[tex] \frac{2s {3}^{} }{r {}^{ - 2} } [/tex]
D)
[tex](5a)^{ - 3} [/tex]
E)
[tex](3x ^{ - 1})^{4} [/tex]