Exam 2: Differentiation: Basic Concepts

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Find f(4)(x)f ^ { ( 4 ) } ( x ) if f(x)=x58x4+7x37x2+7x4f ( x ) = x ^ { 5 } - 8 x ^ { 4 } + 7 x ^ { 3 } - 7 x ^ { 2 } + 7 x - 4 .

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A

Differentiate: f(x)=x2x6f ( x ) = \frac { x ^ { 2 } } { x - 6 }

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D

Find the rate of change of the given function f (x)with respect for x for the prescribed value x = -2. f (x)= x3 + 3x + 9

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C

Differentiate: f(x)=x+7xf ( x ) = \sqrt { x } + \frac { 7 } { \sqrt { x } }

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For f(x)=3xf ( x ) = - \frac { 3 } { \sqrt { x } } ,find the average rate of change of f (x)with respect to x as x changes from 144 to 145.Then use calculus to find the instantaneous rate of change at x = 144.Round your answer to six decimal places,if necessary.

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Find f(x)f ^ { \prime \prime \prime } ( x ) if f(x)=13x3x2+7f ( x ) = \frac { 1 } { \sqrt { 3 x } } - \frac { 3 } { x ^ { 2 } } + \sqrt { 7 }

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Differentiate: f(x)=(x2+1)(x+6)f ( x ) = \left( x ^ { 2 } + 1 \right) ( x + 6 )

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You measure the side of a cube to be 14 centimeters long and conclude that the volume of the cube is 143=2,74414 ^ { 3 } = 2,744 cubic centimeters.If your measurement of the side is accurate to within 2%,approximately how accurate is your calculation of this volume? Round to two decimal places,if necessary.

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The equation of the line tangent to the graph of f(x)=x2+2xf ( x ) = x ^ { 2 } + 2 x at x = 7 is

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An equation for the tangent line to the curve y=(7x2+x1)5y = \left( 7 x ^ { 2 } + x - 1 \right) ^ { 5 } at the point where x = 0 is

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The equation of the line tangent to the graph of f(x)=3xf ( x ) = 3 \sqrt { x } at x = 1 is

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When a certain commodity is sold for p dollars per unit,consumers will buy D(p)=31,500pD ( p ) = \frac { 31,500 } { p } units per month.It is estimated that t months from now,the price of the commodity will be p(t)=t2/3+5.15p ( t ) = t ^ { 2 / 3 } + 5.15 dollars per unit.The approximate rate at which the monthly demand will be changing with respect to time in 27 months is

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Suppose the output at a certain factory is Q=4x3+5x3y4+3y3Q = 4 x ^ { 3 } + 5 x ^ { 3 } y ^ { 4 } + 3 y ^ { 3 } units,where x is the number of hours of skilled labor used and y is the number of hours of unskilled labor.The current labor force consists of 20 hours of skilled labor and 10 hours of unskilled labor.Use calculus to estimate the change in unskilled labor y that should be made to offset a 1-hour increase in skilled labor x so that output will be maintained at its current level.Round you answer to two decimal places,if necessary.

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An efficiency study of the morning shift at a certain factory indicates that an average worker arriving on the job at 7:00 A.M.will have assembled f(x)=x3+7x23xf ( x ) = - x ^ { 3 } + 7 x ^ { 2 } - 3 x transistor radios x hours later.Approximately how many radios will the worker assemble between 9:00 and 9:30 A.M.?

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The function f(x)=x2x+15f ( x ) = \frac { x } { 2 x + 1 } - 5 will decrease by approximately 0.6 as x decreases from 3 to 2.7.

(True/False)
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The largest percentage error you can allow in the measurement of the radius of a sphere if you want the error in the calculation of its surface area using the formula S=4πr2S = 4 \pi r ^ { 2 } to be no greater than 6 percent is about:

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What is the rate of change of f(t)=7t5t+2f ( t ) = \frac { 7 t - 5 } { t + 2 } with respect to t when t = 2?

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Use implicit differentiation to find d2ydx2\frac { d ^ { 2 } y } { d x ^ { 2 } } for 4x5+11y=1004 x ^ { 5 } + 11 y = 100 .

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If f(x)=13x2f ( x ) = \sqrt { 1 - 3 x ^ { 2 } } ,then f(x)=3(13x2)3/2f ^ { \prime \prime } ( x ) = \frac { - 3 } { \left( 1 - 3 x ^ { 2 } \right) ^ { 3 / 2 } } .

(True/False)
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An object moves along a line in such a way that its position at time t is s(t)=t39t2+15t+2s ( t ) = t ^ { 3 } - 9 t ^ { 2 } + 15 t + 2 .Find the velocity and acceleration of the object at time t.When is the object stationary?

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