Direction: Multiply and simplify each rational expression.

1.)
[tex] \frac{7}{x {}^{4} } \: \times \: \frac{x {5}^{} }{21} [/tex]
2.)
[tex] \frac{30b {}^{2} }{6c} \: \times \frac{4c {}^{2} }{15b { \\ }^{4} } [/tex]
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