Chapter 4: Problem 37
Evaluate each expression without using a calculator. $$\log _{4} 1$$
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Chapter 4: Problem 37
Evaluate each expression without using a calculator. $$\log _{4} 1$$
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Find the domain of each logarithmic function. $$ f(x)=\log (7-x) $$
Find the domain of each logarithmic function. $$ f(x)=\log \left(\frac{x-2}{x+5}\right) $$
The loudness level of a sound, \(D,\) in decibels, is given by the formula $$D=10 \log \left(10^{12} I\right)$$ where \(I\) is the intensity of the sound, in watts per meter \(^{2}\). Decibel levels range from \(0,\) a barely audible sound, to \(160,\) a sound resulting in a ruptured eardrum. (Any exposure to sounds of 130 decibels or higher puts a person at immediate risk for hearing damage.) Use the formula to solve. The sound of a blue whale can be heard 500 miles away, reaching an intensity of \(6.3 \times 10^{6}\) watts per meter\(^{2}\). Determine the decibel level of this sound. At close range, can the sound of a blue whale rupture the human eardrum?
Evaluate each expression without using a calculator. $$ \log _{2}\left(\log _{3} 81\right) $$
Evaluate or simplify each expression without using a calculator. $$ \ln e $$
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