Exam 10: Derivatives

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A function and its graph are given. Use the graph to estimate the locations of any vertical asymptotes. ​ A function and its graph are given. Use the graph to estimate the locations of any vertical asymptotes. ​   ​  ​ A function and its graph are given. Use the graph to estimate the locations of any vertical asymptotes. ​   ​

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A rectangular box with a square base is to be formed from a square piece of metal with 30-inch sides. If a square piece with side x is cut from each corner of the metal and the sides are folded up to form an open box, the volume of the box is A rectangular box with a square base is to be formed from a square piece of metal with 30-inch sides. If a square piece with side x is cut from each corner of the metal and the sides are folded up to form an open box, the volume of the box is   . What value of x will maximize the volume of the box? ​  . What value of x will maximize the volume of the box? ​ A rectangular box with a square base is to be formed from a square piece of metal with 30-inch sides. If a square piece with side x is cut from each corner of the metal and the sides are folded up to form an open box, the volume of the box is   . What value of x will maximize the volume of the box? ​

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The following figure shows the graph of revenue function The following figure shows the graph of revenue function   and cost function   . At which of the four x-values shown is the profit largest? ​  and cost function The following figure shows the graph of revenue function   and cost function   . At which of the four x-values shown is the profit largest? ​  . At which of the four x-values shown is the profit largest? ​ The following figure shows the graph of revenue function   and cost function   . At which of the four x-values shown is the profit largest? ​

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Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​ Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and    and Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and    Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and

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The running yard for a dog kennel must contain at least 400 square feet. If a 15-foot side of the kennel is used as part of one side of a rectangular yard with 400 square feet, what dimensions will require the least amount of fencing? Round your answer to the nearest feet. ​​

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Suppose that in an election year, the proportion p of voters who recognize a certain candidate's name t months after the campaign started is given by Suppose that in an election year, the proportion p of voters who recognize a certain candidate's name t months after the campaign started is given by   . After how many months is the proportion maximized? ​ . After how many months is the proportion maximized? ​

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An inferior product with a large advertising budget sells well when it is introduced, but sales fall as people discontinue use of the product. Suppose that the weekly sales S are given by An inferior product with a large advertising budget sells well when it is introduced, but sales fall as people discontinue use of the product. Suppose that the weekly sales S are given by   where S is in millions of dollars and t is in weeks. After how many weeks will sales be maximized? ​ where S is in millions of dollars and t is in weeks. After how many weeks will sales be maximized? ​

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A function and its graph are given. Use the graph to estimate the locations of any horizontal asymptotes. ​ A function and its graph are given. Use the graph to estimate the locations of any horizontal asymptotes. ​    A function and its graph are given. Use the graph to estimate the locations of any horizontal asymptotes. ​

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For the given function find the relative maxima, and sketch the graph. You may check your graph with a graphing utility. For the given function find the relative maxima, and sketch the graph. You may check your graph with a graphing utility.

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Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ , Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ , where x is the number of machines used. Find the critical values of Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ that lie in the domain of the problem. ​ ​

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A function and its graph are given. Use the second derivative to locate all x-values of points of inflection on the graph of A function and its graph are given. Use the second derivative to locate all x-values of points of inflection on the graph of   . Check these results against the graph shown. ​   ​   ​ . Check these results against the graph shown. ​ A function and its graph are given. Use the second derivative to locate all x-values of points of inflection on the graph of   . Check these results against the graph shown. ​   ​   ​ ​ A function and its graph are given. Use the second derivative to locate all x-values of points of inflection on the graph of   . Check these results against the graph shown. ​   ​   ​ ​

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For the given function, find all intervals of x-values where the function is decreasing. For the given function, find all intervals of x-values where the function is decreasing.

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For the revenue function given by For the revenue function given by   find the maximum average revenue. ​ find the maximum average revenue. ​

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Use the sign diagram for Use the sign diagram for   to determine the largest interval on which f (x) decreases, where   and   .  to determine the largest interval on which f (x) decreases, where Use the sign diagram for   to determine the largest interval on which f (x) decreases, where   and   .  and Use the sign diagram for   to determine the largest interval on which f (x) decreases, where   and   .  . Use the sign diagram for   to determine the largest interval on which f (x) decreases, where   and   .

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For the cost function For the cost function   , show that average costs are minimized at the x-value where   by finding this minimum. Round your answer to two decimal places. (​Note:   ) ​​ , show that average costs are minimized at the x-value where For the cost function   , show that average costs are minimized at the x-value where   by finding this minimum. Round your answer to two decimal places. (​Note:   ) ​​ by finding this minimum. Round your answer to two decimal places. (​Note: For the cost function   , show that average costs are minimized at the x-value where   by finding this minimum. Round your answer to two decimal places. (​Note:   ) ​​ ) ​​

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Analytically determine any relative minima. Round your answer to two decimal places. Analytically determine any relative minima. Round your answer to two decimal places.

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The number of milligrams x of a medication in the bloodstream t hours after a dose is taken can be modeled by The number of milligrams x of a medication in the bloodstream t hours after a dose is taken can be modeled by   ,   . Find the t-value at which x is maximum. Round your answer to two decimal places. ​​ , The number of milligrams x of a medication in the bloodstream t hours after a dose is taken can be modeled by   ,   . Find the t-value at which x is maximum. Round your answer to two decimal places. ​​ . Find the t-value at which x is maximum. Round your answer to two decimal places. ​​

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From a tract of land, a developer plans to fence a rectangular region and then divide it into two identical rectangular lots by putting a fence down the middle. Suppose that the fence for the outside boundary costs $6 per foot and the fence for the middle costs $4 per foot. If each lot contains 4,600 square feet, find the dimensions of each lot that yield the minimum cost for the fence. Round your answer to two decimal places. ​​

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Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ , Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​

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Use the sign diagram for Use the sign diagram for   to determine x-values at which relative maxima occur, where   and   .  to determine x-values at which relative maxima occur, where Use the sign diagram for   to determine x-values at which relative maxima occur, where   and   .  and Use the sign diagram for   to determine x-values at which relative maxima occur, where   and   .  . Use the sign diagram for   to determine x-values at which relative maxima occur, where   and   .

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