Chapter 10: Problem 113
Sketch the graph of a function whose derivative exceeds 1 at every point
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Chapter 10: Problem 113
Sketch the graph of a function whose derivative exceeds 1 at every point
These are the key concepts you need to understand to accurately answer the question.
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The balanced difference quotient $$ f^{\prime}(a) \approx \frac{f(a+0.0001)-f(a-0.0001)}{0.0002} $$ is the average rate of change of \(f\) on what interval?
The price per barrel of crude oil in constant 2008 dollars can be approximated by $$ P(t)=0.45 t^{2}-12 t+105 \text { dollars } \quad(0 \leq t \leq 28) $$ where \(t\) is time in years since the start of \(1980.5^{5}\) a. Compute the average rate of change of \(P(t)\) over the interval \([0,28]\), and interpret your answer. HINT [See Section \(10.4\) Example 3.] b. Estimate the instantaneous rate of change of \(P(t)\) at \(t=0\), and interpret your answer. HINT [See Example 2(a).] c. The answers to part (a) and part (b) have opposite signs. What does this indicate about the price of oil?
Give a numerical explanation of the fact that if \(f\) is a linear function, then the average rate of change over any interval equals the instantaneous rate of change at any point.
Find the equation of the tangent to the graph at the indicated point. HINT [Compute the derivative algebraically; then see Example \(2(\mathrm{~b})\) in Section \(10.5 .]\) $$ f(x)=x^{2}+x ; a=-1 $$
Compute the derivative function \(f^{\prime}(x)\) algebraically. (Notice that the functions are the same as those in Exercises \(1-14 .)\) HINT [See Examples 2 and \(3 .]\) $$ f(x)=x^{3}+2 x $$
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