AIR MATH

Math Question

Which expressions are equivalent to the one below? Check all that apply. \( \frac{21^{x}}{7^{x}} \) A. 3 B. \( 3^{x-7} \) C. \( \left(\frac{21}{7}\right)^{x} \) D. \( 3^{x} \) E. \( \frac{7^{x} \cdot 3^{x}}{7^{x}} \) F. \( (21-7)^{x} \)

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