Exam 1: Functions and Models

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If a ball is thrown into the air with a velocity of 58ft/s58 \mathrm { ft } / \mathrm { s } , its height (in feet) after tt seconds is given by H=58t−9t2H = 58 t - 9 t ^ { 2 } , Find the velocity when t=9t = 9 .

(Multiple Choice)
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 Find the limit lim⁡x→3x2+x−12x2−9, if it exists. \text { Find the limit } \lim _ { x \rightarrow 3 } \frac { x ^ { 2 } + x - 12 } { x ^ { 2 } - 9 } \text {, if it exists. }

(Short Answer)
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The position of a car is given by the values in the following table. t (seconds) 0 1 2 3 4 5 s (feet) 0 16 35 71 112 179 Estimate the instantaneous velocity when t=2t = 2 by averaging the velocities for the periods [1,2][ 1,2 ] and [2,3][ 2,3 ] .

(Short Answer)
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Find an expression for the function y=f(x)y = f ( x ) whose graph is the bottom half of the parabola 0x+(6−y)2=00x + ( 6 - y ) ^ { 2 } = 0

(Short Answer)
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Evaluate the limit. lim⁡x→∞10x2−3x+17x2+3x−3\lim _ { x \rightarrow \infty } \frac { 10 x ^ { 2 } - 3 x + 1 } { 7 x ^ { 2 } + 3 x - 3 }

(Short Answer)
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For what value of the constant cc is the function ff continuous on (−∞,∞)( - \infty , \infty ) ? f(x)={cx+5 for x≤2cx2−5 for x>2f ( x ) = \left\{ \begin{array} { l l l } c x + 5 & \text { for } & x \leq 2 \\c x ^ { 2 } - 5 & \text { for } & x > 2\end{array} \right.

(Short Answer)
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 Find the numbers, if any, where the function f(x)=x−3x2−9 is discontinuous. \text { Find the numbers, if any, where the function } f ( x ) = \frac { x - 3 } { x ^ { 2 } - 9 } \text { is discontinuous. }

(Short Answer)
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Find the function f⋅gf \cdot g and its domain if f(x)=x+7f ( x ) = \sqrt { x + 7 } and g(x)=x−7g ( x ) = \sqrt { x - 7 } .0

(Multiple Choice)
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Evaluate the limit. lim⁡x→0(6+x)−1−6−1x\lim _ { x \rightarrow 0 } \frac { ( 6 + x ) ^ { - 1 } - 6 ^ { - 1 } } { x }

(Short Answer)
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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?

(Multiple Choice)
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 Use a graph to find a number δ such that ∣4x+1−3∣<0.1 whenever ∣x−2∣<δ. \text { Use a graph to find a number } \delta \text { such that } | \sqrt { 4 x + 1 } - 3 | < 0.1 \text { whenever } | x - 2 | < \delta \text {. }

(Short Answer)
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Find the numbers, if any, where the function f(x)={3x−2 if x≤10 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.

(Multiple Choice)
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