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Rolf - Finite Mathematics 8/e (Homework)

James Finch

Math - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 1 / 20

Due : Sunday, January 27, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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1/20 (5.0%)

  • Instructions

    Create your course assignments by selecting questions from our bank of end-of-section exercises, as well as enhanced interactive examples with videos.

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    In this assignment we present several textbook question types found in Finite Mathematics 8/e by Howard L. Rolf published by Brooks/Cole.

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1. –/1 points RolfFM8 2.1.020. My Notes
Question Part
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Submissions Used
1
–/1
0/50
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–/1
 
Solve the system of equations by elimination.
7x − 3y = −28
3x + 4y = 25
(x, y) = 
 
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2. –/8 points RolfFM8 2.1.080. My Notes
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Points
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1 2 3 4 5 6 7 8
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
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–/8
 
The demand equation for a computer desk is
p = −3x + 235,
 and the supply equation is
p = 3x + 85.

(a) Graph the supply and demand lines.

(b) Find the equilibrium quantity x and price p. (Round your answers to one decimal place.)
(x, p) = 


(c) Find the price at which the buyer stops buying.
$

(d) Find the price at which the supplier stops supplying.
$

(e) Is there a shortage or surplus when the price is $145? How much?
of computer desks

(f) Is there a shortage or surplus when the price is $208? How much?
of computer desks
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3. –/1 points RolfFM8 2.2.028. My Notes
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1
–/1
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–/1
 
Perform the row operations indicated beside the matrix. Write the matrix obtained.
14−30
01−15
06315
  −4R2 + R1 → R1
 
  −6R2 + R3 → R3

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4. –/1 points RolfFM8 2.5.050. My Notes
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–/1
 
Perform the indicated matrix operation. (If an answer does not exist, enter DNE.)
 
2 3
14
0 1
10
 

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5. –/5 points RolfFM8 2.6.066. My Notes
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Find the inverse of
 
a b
cd
.
 


Determine when the inverse matrix does not exist.
    

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6. 1/2 points  |  Previous Answers RolfFM8 2.8.002. My Notes
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1/2
 
Display the scatter plot for the points (3, 5), (4, 4), (6, 3), (7, 2).
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Submission Data

Correct: Your answer is correct.

Find the regression line. (Round your coefficients to two decimal places.)
y =
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7. –/2 points RolfFM8 2.8.024. My Notes
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An issue of USA Today reported the average fees charged to use another bank's ATM for 2000-2005.
Year              ATM Fee
2000 $2.72
2001 $2.50
2002 $2.73
2003 $2.52
2004 $2.92
2005 $2.98
(a) Use these data to find a least squares line of ATM fees as a function of years since 2000. (Round your coefficients to three decimal places.)
y =


(b) Estimate the average ATM fee for 2013. (Round your answer to the nearest cent.)
$

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