Chapter 10: Problem 12
In Exercises, sketch the graph of the function. $$ f(x)=e^{2 x} $$
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Chapter 10: Problem 12
In Exercises, sketch the graph of the function. $$ f(x)=e^{2 x} $$
These are the key concepts you need to understand to accurately answer the question.
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The term \(t\) (in years) of a \(\$ 200,000\) home mortgage at \(7.5 \%\) interest can be approximated by \(t=-13.375 \ln \frac{x-1250}{x}, x>1250\) where \(x\) is the monthly payment in dollars. (a) Use a graphing utility to graph the model. (b) Use the model to approximate the term of a home mortgage for which the monthly payment is \(\$ 1398.43 .\) What is the total amount paid? (c) Use the model to approximate the term of a home mortgage for which the monthly payment is \(\$ 1611.19 .\) What is the total amount paid? (d) Find the instantaneous rate of change of \(t\) with respect to \(x\) when \(x=\$ 1398.43\) and \(x=\$ 1611.19\). (e) Write a short paragraph describing the benefit of the higher monthly payment.
The sales for exercise equipment in the United States were \(\$ 1824\) million in 1990 and \(\$ 5112\) million in 2005. (a) Use the regression feature of a graphing utility to find an exponential growth model and a linear model for the data. (b) Use the exponential growth model to estimate the sales in 2011 . (c) Use the linear model to estimate the sales in 2011 . (d) Use a graphing utility to graph the models from part (a). Which model is more accurate?
In Exercises, graph and analyze the function. Include any relative extrema and points of inflection in your analysis. Use a graphing utility to verify your results. $$ y=x \ln x $$
In Exercises, use a calculator to evaluate the logarithm. Round to three decimal places. $$ \log _{5} 12 $$
In Exercises, use the given information to write an equation for \(y\). Confirm your result analytically by showing that the function satisfies the equation \(d y / d t=C y .\) Does the function represent exponential growth or exponential decay? $$ \frac{d y}{d t}=2 y, \quad y=10 \text { when } t=0 $$
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