To calculate \( 20^{1/1.13} \), you can first compute the exponent \( \frac{1}{1.13} \) and then raise \( 20 \) to that power.
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Calculate \( \frac{1}{1.13} \): \[ \frac{1}{1.13} \approx 0.885 \]
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Calculate \( 20^{0.885} \): \[ 20^{0.885} \approx 4.27 \]
Therefore, \( 20^{1/1.13} \approx 4.27 \).