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Approximate the logarithm using the properties of logarithms, given logb 2 ? 0.3562, logb 3 ?...

Approximate the logarithm using the properties of logarithms, given

logb 2 ? 0.3562, logb 3 ? 0.5646, and logb 5 ? 0.8271

1. logb 15

2. logb (3/5)

3. logb 81

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