Chapter 3: Problem 77
Use common logarithms or natural logarithms and a calculator to evaluate to four decimal places. $$\log _{\pi} 63$$
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Chapter 3: Problem 77
Use common logarithms or natural logarithms and a calculator to evaluate to four decimal places. $$\log _{\pi} 63$$
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Graph \(f(x)=2^{x}\) and its inverse function in the same rectangular coordinate system.
From 1970 through \(2010 .\) The data are shown again in the table. Use all five data points to solve Exercises \(70-74\). $$\begin{array}{cc}\hline \begin{array}{c}x, \text { Number of Years } \\\\\text { after } 1969 \end{array} & \begin{array}{c}y, \text { U.S. Population } \\\\\text { (millions) }\end{array} \\ \hline 1(1970) & 203.3 \\\11(1980) & 226.5 \\\21(1990) & 248.7 \\\31(2000) & 281.4 \\\41(2010) & 308.7 \end{array}$$ Use your graphing utility's power regression option to obtain a model of the form \(y=a x^{b}\) that fits the data. How well does the correlation coefficient, \(r,\) indicate that the model fits the data?
What is the natural exponential function?
Graph \(f\) and \(g\) in the same rectangular coordinate system. Then find the point of intersection of the two graphs. $$f(x)=2^{x}, g(x)=2^{-x}$$
Use a calculator with \(a\left[y^{x}\right]\) key or \(a \square\) key to solve. The 1986 explosion at the Chernobyl nuclear power plant in the former Soviet Union sent about 1000 kilograms of radioactive cesium-137 into the atmosphere. The function \(f(x)=1000(0.5)^{\frac{x}{30}}\) describes the amount, \(f(x),\) in kilograms, of cesium-137 remaining in Chernobyl \(x\) years after 1986 If even 100 kilograms of cesium- 137 remain in Chernobyl's atmosphere, the area is considered unsafe for human habitation. Find \(f(80)\) and determine if Chernobyl will be safe for human habitation by 2066
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