Chapter 3: Problem 18
write each equation in its equivalent logarithmic form. $$b^{3}=343$$
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Chapter 3: Problem 18
write each equation in its equivalent logarithmic form. $$b^{3}=343$$
These are the key concepts you need to understand to accurately answer the question.
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Describe the product rule for logarithms and give an example.
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 I30 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? Determine the decibel level of this sound. At close range, can the sound of a blue whale rupture the human eardrum?
Use your graphing utility to graph each side of the equation in the same viewing rectangle. Then use the \(x\) -coordinate of the intersection point to find the equation's solution set. Verify this value by direct substitution into the equation. $$2^{x+1}=8$$
Hurricanes are one of nature's most destructive forces. These low-pressure areas often have diameters of over 500 miles. The function \(f(x)=0.48 \ln (x+1)+27\) models the barometric air pressure, \(f(x),\) in inches of mercury, at a distance of \(x\) miles from the eye of a hurricane. Use this function to solve. Graph the function in a \([0,500,50]\) by \([27,30,1]\) viewing rectangle. What does the shape of the graph indicate about barometric air pressure as the distance from the eye increases?
Explain how to solve an exponential equation when both sides cannot be written as a power of the same base. Use \(3^{x}=140\) in your explanation.
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