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OpenStax - College Algebra 1/e (Homework)

James Finch

Math - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 21 / 21

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

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7 8 9 10 11
1/1 1/1 1/1 3/3 5/5 2/2 2/2 1/1 2/2 1/1 2/2
Total
21/21 (100.0%)

  • Instructions

    WebAssign is proud to support the open source teaching community through our partnership with OpenStax. OpenStax’s College Algebra is now enriched with WebAssign homework questions and student learning resources and is available as a low-cost option.

    All questions have socratic feedback and a link to the eBook.

    Questions 1, 7, and 9 have Learn by Example resource available to students.

    Question 2 has a tutorial.

    Question 5 has the student interpret the meaning of the rate of change for this situation. There is also a video available as a student resource to explain this topic.

    Question 8 uses the WebAssign graphing tool to graph a line.

    Question 9 grades any equivalent inequality that describes the relationship between f(x) and g(x).

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1. 1/1 points  |  Previous Answers OSColAlg1 4.1.001. My Notes
Question Part
Points
Submissions Used
1
1/1
3/50
Total
1/1
 
Timmy goes to the fair with $45. Each ride costs $2. How much money m in dollars will he have left after riding n rides?
m =
45−2n
Correct: Your answer is correct. webMathematica generated answer key


†

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2. 1/1 points  |  Previous Answers OSColAlg1 4.1.002.Tut. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
Is
6x + y = 16
 equivalent to the function
f(x) = −6x + 16?

     Correct: Your answer is correct.
Tutorial

Solution or Explanation

  • Part 1 of 1

    Replace y with
    f(x)
     or
    f(x)
     with y and then write the equations in the same form.

    Recall that y and
    f(x)
     are different symbols for the same thing. Replace y with
    f(x)
     in
    6x + y = 16
     and solve for
    f(x)
     so that the equations are in the same form, then compare.
    6x + y = 16
    6x + f(x) = 16
    6x − 6x + f(x) = −6x + 16
    f(x) = −6x + 16
    Is
    6x + y = 16
     equivalent to the function
    f(x) = −6x + 16?
    Yes grey check mark
    No grey cross

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3. 1/1 points  |  Previous Answers OSColAlg1 4.1.003. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
Find the slope of the line graphed.
Correct: Your answer is correct. seenKey

0
WebAssign Plot

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4. 3/3 points  |  Previous Answers OSColAlg1 4.1.004. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 1/1 1/1
2/50 2/50 2/50
Total
3/3
 
The table below shows the input p and output q for a linear function q.
p 0.5 0.8 12 b
q 300 600 a 1,000,000
(a) Fill in the missing values of the table.
a =  Correct: Your answer is correct. seenKey

11,800
b =  Correct: Your answer is correct. seenKey

1,000.2


(b) Write the linear function q.
q =
1000p−200
Correct: Your answer is correct. webMathematica generated answer key


†

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5. 5/5 points  |  Previous Answers OSColAlg1 4.1.005. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
1/1 1/1 1/1 1/1 1/1
1/50 1/50 1/50 1/50 1/50
Total
5/5
 
A phone company charges for service according to the formula
C(n) = 28 + 0.1n,
 where n is the number of minutes talked, and
C(n)
 is the monthly charge, in dollars.

Find the rate of change.
Correct: Your answer is correct. seenKey

0.1

Interpret the rate of change.
For every additional minute talked, the monthly charge Correct: Your answer is correct. seenKey

increases

 by $ Correct: Your answer is correct. seenKey

0.10

 .

Find the initial value.
Correct: Your answer is correct. seenKey

28

Interpret the initial value.
When there are no minutes talked, initially the charge is $ Correct: Your answer is correct. seenKey

28

 .


†

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6. 2/2 points  |  Previous Answers OSColAlg1 4.1.006. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
2/50 1/50
Total
2/2
 
If the graphs of two linear functions are perpendicular, describe the relationship between the slopes and the y-intercepts.

slopes:
     Correct: Your answer is correct.

y-intercepts:
     Correct: Your answer is correct.


†

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7. 2/2 points  |  Previous Answers OSColAlg1 4.1.007. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
1/50 1/50
Total
2/2
 
Find the x- and y-intercepts of the equation.
−3x + 5y = 30
x-intercept    (x, y) = 
−10, 0
Correct: Your answer is correct. webMathematica generated answer key
y-intercept    (x, y) = 
0, 6
Correct: Your answer is correct. webMathematica generated answer key

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8. 1/1 points  |  Previous Answers OSColAlg1 4.1.008. My Notes
Question Part
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1
1/1
2/50
Total
1/1
 
Sketch a line with the given features.
An x-intercept of
(−7, 0)
 and y-intercept of
(0, −8)
No Solution
Help
-10
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9. 2/2 points  |  Previous Answers OSColAlg1 4.1.009. My Notes
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1 2
1/1 1/1
1/50 1/50
Total
2/2
 
Use the functions
f(x) = −0.7x + 600
 and
g(x) = 60x + 0.7.

For which values of x is
f(x)
 greater than
g(x)?
 (Give your answer as an inequality.)
x<5993607​
Correct: Your answer is correct. webMathematica generated answer key

For which values of x is
g(x)
 greater than
f(x)?
 (Give your answer as an inequality.)
x>5993607​
Correct: Your answer is correct. webMathematica generated answer key

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10. 1/1 points  |  Previous Answers OSColAlg1 4.2.001. My Notes
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1/1
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Total
1/1
 
When hired at a new job selling electronics, you are given two pay options.
•  Option A: Base salary of $20,000 a year with a commission of 18% of your sales
•  Option B: Base salary of $26,000 a year with a commission of 9% of your sales
How much electronics would you need to sell for option A to produce a larger income? (Round your answer to the nearest cent.)
You would need to sell more than $ Correct: Your answer is correct. seenKey

66,666.67

 worth of electronics.

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11. 2/2 points  |  Previous Answers OSColAlg1 4.3.001. My Notes
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1/1 1/1
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2/2
 
Consider the following.
x 21 25 30 31 40 50
y
17
11
2
−1
−18
−40
Use the set of data to calculate the regression line using a calculator or other technology tool. (Round the coefficients to three decimal places.)
y =
−1.981x+60.197
Correct: Your answer is correct. webMathematica generated answer key


Determine the correlation coefficient to three decimal places of accuracy.
Correct: Your answer is correct. seenKey

-0.998

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