Exam 13: Functions of Several Variables

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Use Lagrange multipliers to maximize the function Use Lagrange multipliers to maximize the function   subject to the following constraint.   Assume that x and y are positive. subject to the following constraint. Use Lagrange multipliers to maximize the function   subject to the following constraint.   Assume that x and y are positive. Assume that x and y are positive.

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Suppose the centripetal acceleration of a particle moving in a circle is Suppose the centripetal acceleration of a particle moving in a circle is   , where v is the velocity and r is the radius of the circle. Approximate the maximum percent error in measuring the acceleration due to errors of 7% in v and 5% in r. ​ , where v is the velocity and r is the radius of the circle. Approximate the maximum percent error in measuring the acceleration due to errors of 7% in v and 5% in r. ​

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Use polar coordinates to find the limit. [Hint: Let Use polar coordinates to find the limit. [Hint: Let

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Find and simplify Find and simplify   for the given function   . ​ for the given function Find and simplify   for the given function   . ​ . ​

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The two radii of the frustum of a right circular cone are increasing at a rate of 5 centimeters per minute, and the height is increasing at a rate of 12 centimeters per minute (see figure). Find the rate at which the volume is changing when the two radii are 18 centimeters and 30 centimeters, and the height is 14 centimeters. The two radii of the frustum of a right circular cone are increasing at a rate of 5 centimeters per minute, and the height is increasing at a rate of 12 centimeters per minute (see figure). Find the rate at which the volume is changing when the two radii are 18 centimeters and 30 centimeters, and the height is 14 centimeters.

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A rectangular box with an open top has a length of x feet, a width of y feet, and a height of z feet. It costs $1.80 per square foot to build the base and $0.45 per square foot to build the sides. Write the cost C of constructing the box as a function of x, y, and z.

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Find the angle of inclination Find the angle of inclination   of the tangent plane to the surface   at the point   . Round your answer to two decimal places. of the tangent plane to the surface Find the angle of inclination   of the tangent plane to the surface   at the point   . Round your answer to two decimal places. at the point Find the angle of inclination   of the tangent plane to the surface   at the point   . Round your answer to two decimal places. . Round your answer to two decimal places.

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Find the least squares regression line for the points shown in the graph. Find the least squares regression line for the points shown in the graph.

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Find the total differential for the function Find the total differential for the function   . .

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Find the path of a heat-seeking particle placed at point Find the path of a heat-seeking particle placed at point   on a metal plate with a temperature field   . on a metal plate with a temperature field Find the path of a heat-seeking particle placed at point   on a metal plate with a temperature field   . .

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Find the partial derivative Find the partial derivative   for the function   . for the function Find the partial derivative   for the function   . .

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Find symmetric equations of the normal line to the surface Find symmetric equations of the normal line to the surface   at the point   . at the point Find symmetric equations of the normal line to the surface   at the point   . .

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Find the limit Find the limit   for the function   . ​ for the function Find the limit   for the function   . ​ . ​

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Determine the continuity of the composite function Determine the continuity of the composite function   where   and   . ​ where Determine the continuity of the composite function   where   and   . ​ and Determine the continuity of the composite function   where   and   . ​ . ​

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Find the highest point on the curve of intersection of the following surfaces. Cone: Find the highest point on the curve of intersection of the following surfaces. Cone:   , Plane:  , Plane: Find the highest point on the curve of intersection of the following surfaces. Cone:   , Plane:

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Given Given   , calculate   by evaluating   and   . Round your answer to four decimal places. ​ , calculate Given   , calculate   by evaluating   and   . Round your answer to four decimal places. ​ by evaluating Given   , calculate   by evaluating   and   . Round your answer to four decimal places. ​ and Given   , calculate   by evaluating   and   . Round your answer to four decimal places. ​ . Round your answer to four decimal places. ​

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Assume a rule that is one of several methods used to determine the lumber yield of a log (in board-feet) in terms of its diameter d (in inches) and its length L (in feet). The number of board-feet is Assume a rule that is one of several methods used to determine the lumber yield of a log (in board-feet) in terms of its diameter d (in inches) and its length L (in feet). The number of board-feet is   . Find the number of board-feet of lumber in a log 46 inches in diameter and 20 feet in length. . Find the number of board-feet of lumber in a log 46 inches in diameter and 20 feet in length.

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Find the absolute extrema of Find the absolute extrema of   on the region bounded by the square with vertices   and   . ​ on the region bounded by the square with vertices Find the absolute extrema of   on the region bounded by the square with vertices   and   . ​ and Find the absolute extrema of   on the region bounded by the square with vertices   and   . ​ . ​

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Use Lagrange multipliers to find the maximum value of Use Lagrange multipliers to find the maximum value of   where   and   subject to the constraint   . ​ where Use Lagrange multipliers to find the maximum value of   where   and   subject to the constraint   . ​ and Use Lagrange multipliers to find the maximum value of   where   and   subject to the constraint   . ​ subject to the constraint Use Lagrange multipliers to find the maximum value of   where   and   subject to the constraint   . ​ . ​

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Use the gradient to find a normal vector to the graph of the equation at the given point. Use the gradient to find a normal vector to the graph of the equation at the given point.

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