Exam 1: Functions and Models

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 If 6x1f(x)x21,find limx6f(x)\text { If } 6 x - 1 \leq f ( x ) \leq x ^ { 2 } - 1 \text {,find } \lim _ { x \rightarrow 6 } f ( x )

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The graph shows the percentage of households in a certain city watching television during a 24hr24 - h r period on a weekday ( t=0t = 0 corresponds to 6 a.m.). By computing the slope of the respective tangent line, estimate the rate of change of the percentage of households watching television at a-12 p.m. Note that dy=0.03d y = 0.03  The graph shows the percentage of households in a certain city watching television during a  24 - h r  period on a weekday (  t = 0  corresponds to 6 a.m.). By computing the slope of the respective tangent line, estimate the rate of change of the percentage of households watching television at a-12 p.m. Note that  d y = 0.03

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Use the table to evaluate the expression (fg)(6)( f \circ g ) ( 6 ) . x 1 2 3 4 5 6 f(x) 3 2 1 0 1 2 g(x) 6 5 2 3 4 6

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Evaluate the limit. limx1(x+5)3(x26)\lim _ { x \rightarrow 1 } ( x + 5 ) ^ { 3 } \left( x ^ { 2 } - 6 \right)

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If a rock is thrown upward on the planet Mars with a velocity of 12 m/s12 \mathrm {~m} / \mathrm { s } , its height in meters tt seconds later is given by y=12t1.92t2y = 12 t - 1.92 t ^ { 2 } Find the average velocity over the time interval [2,3][ 2,3 ] .

(Multiple Choice)
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It makes sense that the larger the area of a region, the larger the number of species that inhabit the region. Many ecologists have modeled the species-area relation with a power function and, in particular, the number of species SS of bats living in caves in central Mexico has been related to the surface area AA measured in m2m ^ { 2 } of the caves by the equation S=0.7A03S = 0.7 A ^ { 03 } (a) The cave called mission impossible near puebla, mexico, has suface area of A=90 m2A = 90 \mathrm {~m} ^ { 2 } . How many species of bats would expect to find in that cave? (b) If you discover that 5 species of bats live in cave estimate the area of the cave.

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The displacement (in feet) of a certain particle moving in a straight line is given by s=t38s = \frac { t ^ { 3 } } { 8 } where tt is measured in seconds. Find the average velocity over the interval [1,1.19][ 1,1.19 ] . Round your answer to three decimal places.

(Multiple Choice)
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If the point (7,3)( 7,3 ) is on the graph of an even function, what other point must also be on the graph? Select the correct answer.

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Find the limit. limx24x2+13x2\lim _ { x \rightarrow 2 } \sqrt { \frac { 4 x ^ { 2 } + 1 } { 3 x - 2 } }

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The relationship between the Fahrenheit and Celsius temperature scales is given by the linear function. F=95C+32F = \frac { 9 } { 5 } C + 32 What is the FF -intercept and what does it represent?

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Find the numbers, if any, where the function f(x)={3x2 if x10 if x>1f ( x ) = \left\{ \begin{array} { c c } 3 x - 2 & \text { if } x \leq 1 \\ 0 & \text { if } x > 1 \end{array} \right. is discontinuous. Select the correct answer.

(Multiple Choice)
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Let F(x)=x5x5F ( x ) = \frac { x - 5 } { | x - 5 | } . Find the following limits. limx5+F(x),limx5F(x)\lim _ { x \rightarrow 5 ^ { + } } F ( x ) , \lim _ { x \rightarrow 5 ^ { - } } F ( x )

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Find the limit. limxx2252x6\lim _ { x \rightarrow - \infty } \frac { \sqrt { x ^ { 2 } - 25 } } { 2 x - 6 }

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Which of the following graphs is neither even nor odd?

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Determine whether ff is even, odd, or neither. f(x)=4x2x4+5f ( x ) = \frac { 4 x ^ { 2 } } { x ^ { 4 } + 5 }

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Evaluate cot(π4+h)1h.\frac { \cot \left( \frac { \pi } { 4 } + h \right) - 1 } { h } .

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 Find a number δ such that if x2<δ, then 4x8<ε, where ε=0.1\text { Find a number } \delta \text { such that if } | x - 2 | < \delta \text {, then } | 4 x - 8 | < \varepsilon \text {, where } \varepsilon = 0.1 \text {. }

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How close to 2 do we have to take x so that is within a distance of 0.01 from 13?

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 What is the equation of this graph? \text { What is the equation of this graph? } \text { What is the equation of this graph? }

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