Chapter 9: Problem 9
Let \(x=1\) and \(\Delta x=0.01\). Find \(\Delta y\). \(f(x)=\frac{4}{\sqrt[3]{x}}\)
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Chapter 9: Problem 9
Let \(x=1\) and \(\Delta x=0.01\). Find \(\Delta y\). \(f(x)=\frac{4}{\sqrt[3]{x}}\)
These are the key concepts you need to understand to accurately answer the question.
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The variable cost for the production of a calculator is \(\$ 14.25\) and the initial investment is \(\$ 110,000\). Find the total cost \(C\) as a function of \(x\), the number of units produced. Then use differentials to approximate the change in the cost for a one-unit increase in production when \(x=50,000\). Make a sketch showing \(d C\) and \(\Delta C\). Explain why \(d C=\Delta C\) in this problem.
Let \(x=1\) and \(\Delta x=0.01\). Find \(\Delta y\). \(f(x)=\sqrt{3 x}\)
The cost function for a certain model of personal digital assistant (PDA) is given by \(C=13.50 x+45,750\), where \(C\) is measured in dollars and \(x\) is the number of PDAs produced. (a) Find the average cost function \(\bar{C}\). (b) Find \(\bar{C}\) when \(x=100\) and \(x=1000\). (c) Determine the limit of the average cost function as \(x\) approaches infinity. Interpret the limit in the context of the problem.
The table lists the average monthly Social Security benefits \(B\) (in dollars) for retired workers aged 62 and over from 1998 through 2005 . A model for the data is \(B=\frac{582.6+38.38 t}{1+0.025 t-0.0009 t^{2}}, \quad 8 \leq t \leq 15\) where \(t=8\) corresponds to 1998 . $$ \begin{array}{|l|l|l|l|l|l|l|l|l|} \hline t & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \\ \hline B & 780 & 804 & 844 & 874 & 895 & 922 & 955 & 1002 \\ \hline \end{array} $$ (a) Use a graphing utility to create a scatter plot of the data and graph the model in the same viewing window. How well does the model fit the data? (b) Use the model to predict the average monthly benefit in \(2008 .\) (c) Should this model be used to predict the average monthly Social Security benefits in future years? Why or why not?
Determine whether the statement is true or false. If it is false, explain why or give an example that shows it is false. If \(y=a x+b\), then \(\Delta y / \Delta x=d y / d x\)
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