Exam 1: Functions and Applications

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In the Fahrenheit temperature scale, water freezes at 32°F and boils at 212°F. In the Celsius (or centigrade) scale, water freezes at 0°C and boils at 100°C. Assuming that the Fahrenheit temperature F and the Celsius temperature ​C are related by a linear equation, find the Celsius temperature that correspond to 121°F, to the nearest degree. ​ __________ °C

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Use the graph of the function ff to find f(0)f ( 0 ) .  Use the graph of the function  f  to find  f ( 0 )  .

(Multiple Choice)
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Decide which of the two given functions is linear and find its equation. 0 1 2 3 4 f(x) 1 -1.5 -4 -6.5 -9 ( ) 1 -2 -5 -8 -10

(Multiple Choice)
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Find the coefficient of correlation of the line that best fits the data set. {(0,0),(4,15),(7,18)}\{ ( 0,0 ) , ( 4,15 ) , ( 7,18 ) \}

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In the Fahrenheit temperature scale, water freezes at 32°F and boils at 212°F. In the Celsius (or centigrade) scale, water freezes at 0°C and boils at 100°C. Assuming that the Fahrenheit temperature F and the Celsius temperature ​C are related by a linear equation, find the Fahrenheit temperature that corresponds to 61°C, to the nearest degree. ​ __________ °F

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The height of the falling sheet of paper, in feet from the ground, is given by s(t)=1.5t+9s ( t ) = - 1.5 t + 9 after t seconds. When will the sheet of paper reach the ground

(Multiple Choice)
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Find the coefficient of correlation of the line that best fits the data set. ​ {(2,2),(3,2),(7,2)}\{ ( 2,2 ) , ( - 3,2 ) , ( 7 , - 2 ) \} ​ Please give the answer to four decimal places if necessary.

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Graph shows the number of sports utility vehicles f(t)f ( t ) sold in the United States. f(t)f ( t ) represents sales in year t in thousands of vehicles. Find f(10)f ( 10 ) .  Graph shows the number of sports utility vehicles  f ( t )  sold in the United States.  f ( t )  represents sales in year t in thousands of vehicles. Find  f ( 10 )  .

(Multiple Choice)
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In the Fahrenheit temperature scale, water freezes at 32°F and boils at 212°F. In the Celsius (or centigrade) scale, water freezes at 0°C and boils at 100°C. Assuming that the Fahrenheit temperature F and the Celsius temperature C are related by a linear equation, find the Fahrenheit temperature that correspond to 26°C, to the nearest degree. ​

(Multiple Choice)
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Graph shows the number of sports utility vehicles f(x)f ( x ) sold in the United States. f(x)f ( x ) represents sales in year t in thousands of vehicles. Use the graph to estimate the smallest value of f(x)f ( x ) for 2t92 \leq t \leq 9 .  Graph shows the number of sports utility vehicles  f ( x )  sold in the United States.  f ( x )  represents sales in year t in thousands of vehicles. Use the graph to estimate the smallest value of  f ( x )  for  2 \leq t \leq 9  .

(Multiple Choice)
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The following table shows the approximate value V of one Euro in U.S dollars from its introduction in January 2000 to January 2004. ( t=0t = 0 represents January, 2000.) ( Year ) 0 2 4 ( Value in ) 1.00 0.90 1.25 Which model would best fit the given data (A, a, b, c, k, l, and m are constants.)

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Following are approximate values of the Amex Gold BUGS Index. Year 0 2 4 Index 50 100 250 ( x=0x = 0 represents 2000) Obtain the associated regression line. (Round coefficients to 2 decimal places if necessary.) Use your regression equation to project the 2001 sales.

(Multiple Choice)
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Calculate the slope of the straight line through the points (1,0)( - 1,0 ) and (78,14)\left( - \frac { 7 } { 8 } , \frac { 1 } { 4 } \right) . Try to do the calculation mentally.

(Multiple Choice)
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Find the best-fit line associated with the set of points. (1,5)( 1,5 ) , (3,14)( 3,14 ) , (5,24)( 5,24 ) , (7,0)( 7,0 )

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You can sell 90 pet chias per week if they are marked as $1 each, but only 40 per week if they are marked $2 per chia. Your chia supplier is prepared to sell you 25 chias per week if they are marked $1 per chia, and 75 per week if they are marked $2 per chia. Write the associated linear demand and supply functions.

(Multiple Choice)
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Sketch the straight line of the following equation. y=5x3y = 5 x - 3

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Sketch the straight line with the equation. 6x=126 x = 12

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Graph shows the number of sports utility vehicles f(t)f ( t ) sold in the United States. f(t)f ( t ) represents sales in year t in thousands of vehicles. Find f(7)f ( 7 ) .  Graph shows the number of sports utility vehicles  f ( t )  sold in the United States.  f ( t )  represents sales in year t in thousands of vehicles. Find  f ( 7 )  .

(Multiple Choice)
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A police car was traveling down Ocean Parkway in a high-speed chase from Jones Beach. The car was at Jones Beach at exactly 9:00 p.m. (t=0)( t = 0 ) , and was at Oak Beach, 13 miles from Jones Beach, at exactly 9:04 p.m. How fast was the police car traveling (Round your answer to the nearest tenth.)

(Multiple Choice)
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Find the coefficient of correlation of the line that best fits the data set. ​ {(3,6),(4,7),(7,13)}\{ ( 3,6 ) , ( 4,7 ) , ( 7,13 ) \} ​ Please give the answer to four decimal places if necessary.

(Short Answer)
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