To simplify \( 25^{3/2} \), you can proceed as follows:
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Rewrite \( 25 \) as \( 5^2 \): \[ 25^{3/2} = (5^2)^{3/2} \]
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Apply the power of a power property, which states that \( (a^m)^n = a^{m \cdot n} \): \[ (5^2)^{3/2} = 5^{2 \cdot \frac{3}{2}} = 5^3 \]
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Now calculate \( 5^3 \): \[ 5^3 = 125 \]
Thus, the simplified form of \( 25^{3/2} \) is \( \boxed{125} \).