Chapter 0: Problem 27
Solve the equation and check your solution. (If not possible, explain why.) $$ x+8=2(x-2)-x $$
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Chapter 0: Problem 27
Solve the equation and check your solution. (If not possible, explain why.) $$ x+8=2(x-2)-x $$
These are the key concepts you need to understand to accurately answer the question.
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Each function models the specified data for the years 1995 through 2005 , with \(t=5\) corresponding to 1995 . Estimate a reasonable scale for the vertical axis (e.g., hundreds, thousands, millions, etc.) of the graph and justify your answer. (There are many correct answers.) (a) \(f(t)\) represents the average salary of college professors. (b) \(f(t)\) represents the U.S. population. (c) \(f(t)\) represents the percent of the civilian work force that is unemployed.
In Exercises 39-54, (a) find the inverse function of \(f\), (b) graph both \(f\) and \(f^{-1}\) on the same set of coordinate axes, (c) describe the relationship between the graphs of \(f\) and \(f^{-1}\), and (d) state the domain and range of \(f\) and \(f^{-1}\). $$ f(x)=\frac{x-3}{x+2} $$
Find the average rate of change of the function from \(x_{1}\) to \(x_{2}\). $$ \begin{array}{cc} \text { Function } & x \text {-Values } \\ f(x)=x^{2}+12 x-4 & \quad x_{1}=1, x_{2}=5 \end{array} $$
In Exercises 55-68, determine whether the function has an inverse function. If it does, find the inverse function. $$ f(x)=\sqrt{2 x+3} $$
Prescription Drugs The amounts \(d\) (in billions of dollars) spent on prescription drugs in the United States from 1991 to 2002 (see figure) can be approximated by the model $$ d(t)= \begin{cases}5.0 t+37, & 1 \leq t \leq 7 \\ 18.7 t-64, & 8 \leq t \leq 12\end{cases} $$ where \(t\) represents the year, with \(t=1\) corresponding to 1991. Use this model to find the amount spent on prescription drugs in each year from 1991 to 2002 . (Source: U.S. Centers for Medicare \& Medicaid Services)
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