Exam 1: Functions,graphs,and Limits

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Find the slope and y-intercept (if they exist)of the line 8y = 7x.

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C

Find the indicated limit if it exists. lim⁡x→3(x+4)\lim _ { x \rightarrow 3 } ( x + 4 )

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D

Two car rental agencies are competing.One agency rents cars for 50 dollars per day and 35 cents a mile; the other agency rents cars for 35 dollars per day and 45 cents a mile.For a 10 day trip,how many miles must you travel to have the total cost be the same with each agency? Round to the nearest whole mile ,if necessary.

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Each unit of a certain commodity costs p = 47x + 12 cents when x units of the commodity are produced.If all units are sold at this price,express the revenue derived from the sales as a function of x.

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Sketch the graph of the given function. f(x)=x2+2f ( x ) = x ^ { 2 } + 2

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Find the distance between the given points. (-2,6)and (3,7)

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An efficiency consultant determines that when new workers are hired to wait tables at an upscale restaurant,the average number of tables they can wait on in a 6 hour shift is given by N(x)=5.3x2+50x+140.1x+0.8N ( x ) = \frac { \sqrt { 5.3 x ^ { 2 } + 50 x + 14 } } { 0.1 x + 0.8 } where x is the number of shifts they've worked since being hired.What happens to an average waiter's productivity in the long run (as x→∞x \rightarrow \infty )?

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Find the indicated limit if it exists. lim⁡x→1x2+3x+2x2−1\lim _ { x \rightarrow 1 } \frac { x ^ { 2 } + 3 x + 2 } { x ^ { 2 } - 1 }

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The cost of renting a backhoe at one distributor is $325,plus $35 per day.Write a linear function C(x)that describes the cost of renting the backhoe for x days,then use your function to find how much it would cost to rent it for 12 days.

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Compute the indicated value of the given function. f(t)={−2t+8 if t<−1t2+9 if t≥−1f ( t ) = \left\{ \begin{aligned}- 2 t + 8 & \text { if } t < - 1 \\t ^ { 2 } + 9 & \text { if } t \geq - 1\end{aligned} \right. ; f (-3)

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Find the difference quotient, f(x+h)−f(x)h\frac { f ( x + h ) - f ( x ) } { h } . f(x)=9xf ( x ) = \frac { 9 } { x }

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List all values of x for which f (x)is not continuous. f(x)=2x+1x2+xf ( x ) = \frac { 2 x + 1 } { x ^ { 2 } + x } .

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Plot the given point in a rectangular coordinate system. (1,-5)

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Find lim⁡x→+∞f(x)\lim _ { x \rightarrow + \infty } f ( x ) and lim⁡x→−∞f(x)\lim _ { x \rightarrow - \infty } f ( x ) .If the limiting value is infinite indicate whether it is + ∞\infty or - ∞\infty . f (x)= (5 - 9x)(x - 2)

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Find the indicated one-sided limit.If the limiting value is infinite,indicate whether it is + ∞\infty or - ∞\infty . lim⁡x→4−x−2x−4\lim _ { x \rightarrow 4 ^ { - } } \frac { \sqrt { x } - 2 } { x - 4 }

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Find lim⁡x→+∞f(x)\lim _ { x \rightarrow + \infty } f ( x ) and lim⁡x→−∞f(x)\lim _ { x \rightarrow - \infty } f ( x ) .If the limiting value is infinite indicate whether it is + ∞\infty or - ∞\infty . f(x)=4−2x36x3−6x+1f ( x ) = \frac { 4 - 2 x ^ { 3 } } { 6 x ^ { 3 } - 6 x + 1 }

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Find the indicated one-sided limit.If the limiting value is infinite,indicate whether it is + ∞\infty or - ∞\infty . lim⁡x→2−f(x)\lim _ { x \rightarrow 2 ^ { - } } f ( x ) where f(x)={x+5 if x<2x2 if x≥2f ( x ) = \left\{ \begin{aligned}x + 5 & \text { if } x < 2 \\x ^ { 2 } & \text { if } x \geq 2\end{aligned} \right.

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Find the indicated composite function. f (x + 6)where f(x)=1xf ( x ) = \frac { 1 } { x }

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A closed box with a square base is to have a volume of 10 cubic meters.The material for the top and bottom of the box costs $5 per square meter,and the material for the sides costs $1 per square meter.Express the construction cost of the box as a function of the length of its base,x.

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Find the points of intersection (if any)of the given pair of curves. y=x2y = x ^ { 2 } and y = 3x - 2.

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