Chapter 3: Problem 32
Use the laws of logarithms to solve the equation. $$\log _{3} 27=2 x$$
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Chapter 3: Problem 32
Use the laws of logarithms to solve the equation. $$\log _{3} 27=2 x$$
These are the key concepts you need to understand to accurately answer the question.
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Refer to Exercise \(4 .\) a. If the world population continues to grow at the rate of approximately \(2 \% / y e a r\), find the length of time \(t_{0}\) required for the world population to triple in size. b. Using the time \(t_{0}\) found in part (a), what would be the world population if the growth rate were reduced to \(1.8 \% / y e a r ?\)
Sketch the graphs of the given functions on the same axes. \(y=e^{x}, y=2 e^{x}\), and \(y=3 e^{x}\)
The relative loudness of a sound \(D\) of intensity \(I\) is measured in decibels (db), where $$ D=10 \log \frac{I}{I_{0}} $$ and \(I_{0}\) is the standard threshold of audibility. a. Express the intensity \(I\) of a 30 -db sound (the sound level of normal conversation) in terms of \(I_{0}\). b. Determine how many times greater the intensity of an 80 -db sound (rock music) is than that of a 30 -db sound. c. Prolonged noise above \(150 \mathrm{db}\) causes permanent deafness. How does the intensity of a 150 -db sound compare with the intensity of an 80 -db sound?
The percentage of families that were married households between 1970 and 2000 is approximately $$ P(t)=86.9 e^{-0.05 t} \quad(0 \leq t \leq 3) $$ where \(t\) is measured in decades, with \(t=0\) corresponding to the beginning of 1970 . a. What percentage of families were married households at the beginning of \(1970,1980,1990\), and 2000 ? b. Sketch the graph of \(P\).
Given that \(\log 3 \approx 0.4771\) and \(\log 4 \approx\) 0.6021, find the value of each logarithm. $$\log 16$$
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