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OpenStax - Precalculus 1/e (Homework)

James Finch

Math - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 13 / 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 0/1 2/3 5/5 2/2 2/2 0/1 0/2 –/1 –/2
Total
13/21 (61.9%)

  • Instructions

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

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1. 1/1 points  |  Previous Answers OSPreCalc1 2.1.006. My Notes
Question Part
Points
Submissions Used
1
1/1
3/50
Total
1/1
 
Timmy goes to the fair with $20. Each ride costs $2. How much money m in dollars will he have left after riding n rides?
m =
20−2n
Correct: Your answer is correct. webMathematica generated answer key


†

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2. 1/1 points  |  Previous Answers OSPreCalc1 2.1.007-037.Tut. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
Is
4x + y = 16
 equivalent to the function
f(x) = −4x + 16?

     Correct: Your answer is correct.


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
    4x + y = 16
     and solve for
    f(x)
     so that the equations are in the same form, then compare.
    4x + y = 16
    4x + f(x) = 16
    4x − 4x + f(x) = −4x + 16
    f(x) = −4x + 16
    Is
    4x + y = 16
     equivalent to the function
    f(x) = −4x + 16?
    Yes grey check mark
    No grey cross

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3. 0/1 points  |  Previous Answers OSPreCalc1 2.1.040. My Notes
Question Part
Points
Submissions Used
1
0/1
2/50
Total
0/1
 
Find the slope of the line graphed.
Incorrect: Your answer is incorrect. seenKey

0
WebAssign Plot
Note that for any two distinct points chosen on a horizontal line, the y-coordinates are the same. What does this mean for the change in the output values?

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4. 2/3 points  |  Previous Answers OSPreCalc1 2.1.059. My Notes
Question Part
Points
Submissions Used
1 2 3
0/1 1/1 1/1
2/50 1/50 3/50
Total
2/3
 
The table below shows the input p and output q for a linear function q.
p 0.5 0.8 15 b
q 200 500 a 1,000,000
(a) Fill in the missing values of the table.
a = 
b =  Correct: Your answer is correct. seenKey

1,000.3


(b) Write the linear function q.
q =
1000p−300
Correct: Your answer is correct. webMathematica generated answer key

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5. 5/5 points  |  Previous Answers OSPreCalc1 2.1.071. My Notes
Question Part
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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) = 27 + 0.2n,
 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

0.2

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

0.20

 .

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

27

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

27

 .

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6. 2/2 points  |  Previous Answers OSPreCalc1 2.2.078. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
1/50 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 OSPreCalc1 2.2.092. My Notes
Question Part
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1 2
1/1 1/1
1/50 1/50
Total
2/2
 
Find the x- and y-intercepts of the equation.
−3x + 4y = 24
x-intercept    (x, y) = 
−8,0
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. 0/1 points  |  Previous Answers OSPreCalc1 2.2.114. My Notes
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0/1
 
Sketch a line with the given features.
An x-intercept of
(−7, 0)
 and y-intercept of
(0, −6)
No Solution
Help
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9. 0/2 points  |  Previous Answers OSPreCalc1 2.2.149. My Notes
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1 2
0/1 0/1
1/50 1/50
Total
0/2
 
Use the functions
f(x) = −0.9x + 400
 and
g(x) = 40x + 0.9.

For which values of x is
f(x)
 greater than
g(x)?
 (Give your answer as an inequality.)
x<9.76
Incorrect: Your answer is incorrect. webMathematica generated answer key

For which values of x is
g(x)
 greater than
f(x)?
 (Give your answer as an inequality.)
x>9.76
Incorrect: Your answer is incorrect. webMathematica generated answer key
Note that the unique point of intersection of two linear functions is the point x0 where
f(x0) = g(x0).
 On what interval on the x-axis would
f(x) > g(x)?
 On what interval would
g(x) > f(x)?

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10. –/1 points OSPreCalc1 2.3.209. My Notes
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1
–/1
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–/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 17% of your sales
•  Option B: Base salary of $25,000 a year with a commission of 8% 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 $ worth of electronics.

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11. –/2 points OSPreCalc1 2.4.239. My Notes
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–/1 –/1
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–/2
 
Consider the following.
x 21 25 30 31 40 50
y
16
10
1
−2
−19
−41
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 =


Determine the correlation coefficient to three decimal places of accuracy.

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