Respuesta :

we have the expression

[tex]\frac{21^x}{3^{^x}}[/tex]

so

[tex]\begin{gathered} \frac{21^x}{3^x}=\frac{(3*7)^x}{3^x}=7^x \\ \\ \frac{21^{x}}{3^{x}}=(\frac{21}{3})^x \end{gathered}[/tex]

therefore

the answers are

options B, C and D

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