Exam 13: Functions

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Find two numbers whose sum is 48 and whose product is a maximum.

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If V varies jointly as B and h , and V = 30 when B = 9 and h = 10, find V when B = 16 and h = 18.

(Short Answer)
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If f ( x ) = |9 x −- 5| and g ( x ) = x 3 , find (g∘f)(1)( g \circ f ) ( 1 ) .

(Multiple Choice)
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Determine (g∘f)(x)( g \circ f ) ( x ) for the pair of functions f(x)=34x and g(x)=1x+3f ( x ) = \frac { 3 } { 4 x } \text { and } g ( x ) = \frac { 1 } { x + 3 } .

(Short Answer)
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Specify the domain for the function. f(x)=x2−4f ( x ) = \sqrt { x ^ { 2 } - 4 }

(Multiple Choice)
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Specify the domain of (g∘f)(x)( g \circ f ) ( x ) for the pair of functions f(x)=5x and g(x)=4x−8f ( x ) = \frac { 5 } { x } \text { and } g ( x ) = 4 x - 8 . Please enter your answer in interval notation.

(Short Answer)
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Specify the domain for the function. Please enter your answer in interval notation. f ( x ) = 4 x −- 9

(Short Answer)
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If f ( x ) = |9 x −- 5| and g ( x ) = x 3 , find (f∘g)(1) and (g∘f)(1)( f \circ g ) ( 1 ) \text { and } ( g \circ f ) ( 1 ) . Match each expression with the corresponding answer. - 6464

(Multiple Choice)
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If y is directly proportional to x , and y = 14 when x = 56, find the value of y when x = 40.

(Short Answer)
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Find the vertex of f(x)=5x2−7x+2f ( x ) = 5 x ^ { 2 } - 7 x + 2 .

(Short Answer)
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Graph the function. f(x)=16∣x∣f ( x ) = \frac { 1 } { 6 } | x |

(Multiple Choice)
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Specify the domain of (g∘f)(x)( g \circ f ) ( x ) for the pair of functions f(x)=5x and g(x)=7x−5f ( x ) = \frac { 5 } { x } \text { and } g ( x ) = 7 x - 5

(Multiple Choice)
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Graph the function. f(x)=−∣x+4∣f ( x ) = - | x + 4 |

(Multiple Choice)
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Determine (g∘f)(x)( g \circ f ) ( x ) for the pair of functions f(x)=x+8 and g(x)=9x+4f ( x ) = \sqrt { x + 8 } \text { and } g ( x ) = 9 x + 4

(Multiple Choice)
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Specify the range for the following relation. Please enter your answer as the numbers, separated by commas. {(2, 3), (9, 6), (12, 11), (16, 15)}

(Short Answer)
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