Intermediate Algebra (8th Edition)
Intermediate Algebra (8th Edition)
8th Edition
ISBN: 9780134178967
Author: John Tobey Jr., Jeffrey Slater, Jamie Blair, Jenny Crawford
Publisher: PEARSON
bartleby

Concept explainers

Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as p…
bartleby

Videos

Textbook Question
Book Icon
Chapter 3.4, Problem 3E

Verbal and Writing Skills, Exercises 1-6

When graphing x > 5 , should the region to the left of the line x = 5 be shaded or should the region to the right of the line x = 5 be shaded?

Expert Solution & Answer
Check Mark

Want to see the full answer?

Check out a sample textbook solution
Blurred answer
Previous
Chapter 3.4, Problem 2E
Next
Chapter 3.4, Problem 4E
Students have asked these similar questions
Solve the linear system of equations attached using Gaussian elimination (not Gauss-Jordan) and back subsitution. Remember that: A matrix is in row echelon form if Any row that consists only of zeros is at the bottom of the matrix. The first non-zero entry in each other row is 1. This entry is called aleading 1. The leading 1 of each row, after the first row, lies to the right of the leading 1 of the previous row.
PRIMERA EVALUACIÓN SUMATIVA 10. Determina la medida de los ángulos in- teriores coloreados en cada poligono. ⚫ Octágono regular A 11. Calcula es número de lados qu poligono regular, si la medida quiera de sus ángulos internos • a=156° A= (-2x+80 2 156 180- 360 0 = 24-360 360=24° • a = 162° 1620-180-360 6=18-360 360=19 2=360= 18 12. Calcula las medida ternos del cuadrilá B X+5 x+10 A X+X+ Sx+6 5x=3 x=30 0 лаб • Cuadrilátero 120° 110° • α = 166° 40' 200=180-360 0 = 26-360 360=20 ひ=360 20 18 J 60° ⚫a=169° 42' 51.43" 169.4143180-340 0 = 10.29 54-360 360 10.2857 2=360 10.2857 @Sa
Please help I'm a working mom trying to help my son last minute (6th grader)! Need help with the blank ones and check the ones he got with full calculation so we can use it to study! Especially the mixed number fractions cause I'm rusty. Thanks in advance!

Chapter 3 Solutions

Intermediate Algebra (8th Edition)

Ch. 3.1 - Verbal and Writing Skills, Exercises 1-4 1. Graphs...Ch. 3.1 - Verbal and Writing Skills, Exercises 1-4 2. The...Ch. 3.1 - Verbal and Writing Skills, Exercises 1-4 Explain...Ch. 3.1 - Verbal and Writing Skills, Exercises 1-4 (5, 1) is...Ch. 3.1 - Find the missing coordinate. ( − 2 , _ _ _ _ ) is...Ch. 3.1 - Find the missing coordinate. ( − 5 , _ _ _ _ ) is...Ch. 3.1 - Find the missing coordinate. 7. is a solution of...Ch. 3.1 - Find the missing coordinate. ( _ _ _ _ _ , 2 3 )...Ch. 3.1 - Graph each equation. y = 2 x − 3Ch. 3.1 - Graph each equation. 10.
Ch. 3.1 - Graph each equation. y = 1 − 3 xCh. 3.1 - Graph each equation. 12. Ch. 3.1 - Graph each equation. 12. Ch. 3.1 - Graph each equation. y = 5 2 x + 1Ch. 3.1 - Simplify the equation if possible. Find the...Ch. 3.1 - Simplify the equation if possible. Find the...Ch. 3.1 - Simplify the equation if possible. Find the...Ch. 3.1 - Simplify the equation if possible. Find the...Ch. 3.1 - Simplify the equation if possible. Find the...Ch. 3.1 - Simplify the equation if possible. Find the...Ch. 3.1 - Simplify the equation if possible. Find the...Ch. 3.1 - Simplify the equation if possible. Find the...Ch. 3.1 - Simplify the equation if possible. State whether...Ch. 3.1 - Simplify the equation if possible. State whether...Ch. 3.1 - Simplify the equation if possible. State whether...Ch. 3.1 - Simplify the equation if possible. State whether...Ch. 3.1 - Simplify the equation if possible. State whether...Ch. 3.1 - Simplify the equation if possible. State whether...Ch. 3.1 - Simplify the equation if possible. State whether...Ch. 3.1 - Simplify each equation if possible. Then graph the...Ch. 3.1 - Simplify each equation if possible. Then graph the...Ch. 3.1 - Simplify each equation if possible. Then graph the...Ch. 3.1 - Simplify each equation if possible. Then graph the...Ch. 3.1 - Simplify each equation if possible. Then graph the...Ch. 3.1 - Graph each equation. Use appropriate scales on...Ch. 3.1 - Graph each equation. Use appropriate scales on...Ch. 3.1 - Income of Men Versus Women The following graph...Ch. 3.1 - Income of Men Versus Women The following graph...Ch. 3.1 - Income of Men Versus Women The following graph...Ch. 3.1 - Income of Men Versus Women The following graph...Ch. 3.1 - Income of Men Versus Women The following graph...Ch. 3.1 - Prob. 42ECh. 3.1 - 43. Baseball If a baseball is thrown vertically...Ch. 3.1 - 44. Gasoline Storage Tank A full storage tank on...Ch. 3.1 - [1.3.3] Evaluate 36 ÷ ( 8 − 6 ) 2 + 3 ( − 4 )Ch. 3.1 - Prob. 46ECh. 3.1 - 47. [2.4.1.] Balloon Giveaway A novelty company is...Ch. 3.1 - Prob. 48ECh. 3.1 - Prob. 1QQCh. 3.1 - Prob. 2QQCh. 3.1 - Prob. 3QQCh. 3.1 - Prob. 4QQCh. 3.2 - Verbal and Writing Skills, Exercises 1-6 Slope...Ch. 3.2 - Verbal and Writing Skills, Exercises 1-6 A...Ch. 3.2 - Verbal and Writing Skills, Exercises 1-6 The slope...Ch. 3.2 - Verbal and Writing Skills, Exercises 1-6 4. Two...Ch. 3.2 - Verbal and Writing Skills, Exercises 1-6 5. Does...Ch. 3.2 - Prob. 6ECh. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - Find the slope, if possible, of the line passing...Ch. 3.2 - 19. Snowboarding Find the slope (grade) of a...Ch. 3.2 - 20. Grade of a Road Find the grade of a mountain...Ch. 3.2 - Rock Formation Find the slope (pitch) of a...Ch. 3.2 - Pitch of a Roof Find the slope (pitch) of a roof...Ch. 3.2 - 23. Slope of Street Baldwin Street in Dunedin, New...Ch. 3.2 - 24. Slope of a Roller Coaster Goliath at Six Flags...Ch. 3.2 - Find the slope of a line parallel to the line that...Ch. 3.2 - Find the slope of a line parallel to the line that...Ch. 3.2 - Find the slope of a line parallel to the line that...Ch. 3.2 - Find the slope of a line parallel to the line that...Ch. 3.2 - Prob. 29ECh. 3.2 - Find the slope of a line parallel to the line that...Ch. 3.2 - Find the slope of a line perpendicular to the line...Ch. 3.2 - Find the slope of a line perpendicular to the line...Ch. 3.2 - Find the slope of a line perpendicular to the line...Ch. 3.2 - Find the slope of a line perpendicular to the line...Ch. 3.2 - Prob. 35ECh. 3.2 - Prob. 36ECh. 3.2 - A line k passes through the points ( − 3 , − 9 )...Ch. 3.2 - Prob. 38ECh. 3.2 - Prob. 39ECh. 3.2 - 40. Do the points , and C(8,1) lie on a straight...Ch. 3.2 - 41. Architect Most new buildings are required to...Ch. 3.2 - Rate of Climb of Aircraft A small Cessna plane...Ch. 3.2 - Prob. 43ECh. 3.2 - Prob. 44ECh. 3.2 - Prob. 45ECh. 3.2 - Prob. 46ECh. 3.2 - Prob. 1QQCh. 3.2 - Prob. 2QQCh. 3.2 - Prob. 3QQCh. 3.2 - Prob. 4QQCh. 3.3 - Verbal and Writing Skills, Exercises 1 and 2 You...Ch. 3.3 - Verbal and Writing Skills, Exercises 1 and 2 2....Ch. 3.3 - Write an equation of the line with the given slope...Ch. 3.3 - Write an equation of the line with the given slope...Ch. 3.3 - Write an equation of the line with the given slope...Ch. 3.3 - Write an equation of the line with the given slope...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Find the slope and y-intercept of each of the...Ch. 3.3 - Write each equation in slope-intercept form. Then...Ch. 3.3 - Prob. 17ECh. 3.3 - Write each equation in slope-intercept form. Then...Ch. 3.3 - Write each equation in slope-intercept form. Then...Ch. 3.3 - Write each equation in slope-intercept form. Then...Ch. 3.3 - Write each equation in slope-intercept form. Then...Ch. 3.3 - For each equation find the slope and the...Ch. 3.3 - Prob. 23ECh. 3.3 - For each equation find the slope and the...Ch. 3.3 - For each equation find the slope and the...Ch. 3.3 - Prob. 26ECh. 3.3 - Find an equation of the line that passes through...Ch. 3.3 - Find an equation of the line that passes through...Ch. 3.3 - Find an equation of the line that passes through...Ch. 3.3 - Find an equation of the line that passes through...Ch. 3.3 - Find an equation of the line that passes through...Ch. 3.3 - Find an equation of the line passing through the...Ch. 3.3 - Find an equation of the line passing through the...Ch. 3.3 - Find an equation of the line passing through the...Ch. 3.3 - Find an equation of the line passing through the...Ch. 3.3 - Find an equation of the line passing through the...Ch. 3.3 - Prob. 37ECh. 3.3 - Prob. 38ECh. 3.3 - Prob. 39ECh. 3.3 - Find an equation of the line satisfying the...Ch. 3.3 - Find an equation of the line satisfying the...Ch. 3.3 - Find an equation of the line satisfying the...Ch. 3.3 - Find an equation of the line satisfying the...Ch. 3.3 - Prob. 44ECh. 3.3 - Find an equation of the line satisfying the...Ch. 3.3 - Prob. 46ECh. 3.3 - Without graphing, determine whether the following...Ch. 3.3 - Prob. 48ECh. 3.3 - Without graphing, determine whether the following...Ch. 3.3 - Prob. 50ECh. 3.3 - Without graphing, determine whether the following...Ch. 3.3 - Prob. 52ECh. 3.3 - Prob. 53ECh. 3.3 - Prob. 54ECh. 3.3 - Prob. 55ECh. 3.3 - Prob. 56ECh. 3.3 - Cost of Homes The median sale price of...Ch. 3.3 - Prob. 58ECh. 3.3 - Prob. 59ECh. 3.3 - Prob. 60ECh. 3.3 - Prob. 61ECh. 3.3 - Prob. 1QQCh. 3.3 - Prob. 2QQCh. 3.3 - Prob. 3QQCh. 3.3 - Prob. 4QQCh. 3.4 - Verbal and Writing Skills, Exercises 1-6 Explain...Ch. 3.4 - Prob. 2ECh. 3.4 - Verbal and Writing Skills, Exercises 1-6 When...Ch. 3.4 - Prob. 4ECh. 3.4 - Verbal and Writing Skills, Exercises 1-6 5. When...Ch. 3.4 - Prob. 6ECh. 3.4 - Prob. 7ECh. 3.4 - Prob. 8ECh. 3.4 - Graph each region. 9. Ch. 3.4 - Prob. 10ECh. 3.4 - Prob. 11ECh. 3.4 - Prob. 12ECh. 3.4 - Prob. 13ECh. 3.4 - Graph each region. 6 y − x ≤ 12Ch. 3.4 - Prob. 15ECh. 3.4 - Prob. 16ECh. 3.4 - Graph each region. 17. Ch. 3.4 - Graph each region. x − 3 y ≥ 0Ch. 3.4 - Simplify and graph each inequality in a...Ch. 3.4 - Simplify and graph each inequality in a...Ch. 3.4 - Simplify and graph each inequality in a...Ch. 3.4 - Prob. 22ECh. 3.4 - Simplify and graph each inequality in a...Ch. 3.4 - Simplify and graph each inequality in a...Ch. 3.4 - Simplify and graph each inequality in a...Ch. 3.4 - Simplify and graph each inequality in a...Ch. 3.4 - Prob. 27ECh. 3.4 - Prob. 28ECh. 3.4 - Prob. 29ECh. 3.4 - Prob. 1QQCh. 3.4 - Prob. 2QQCh. 3.4 - Prob. 3QQCh. 3.4 - Prob. 4QQCh. 3.5 - Verbal and Writing Skills, Exercises 1-4 Explain...Ch. 3.5 - Prob. 2ECh. 3.5 - Verbal and Writing Skills, Exercises 1-4 What are...Ch. 3.5 - Prob. 4ECh. 3.5 - What are the domain and range of each relation? Is...Ch. 3.5 - What are the domain and range of each relation? Is...Ch. 3.5 - What are the domain and range of each relation? Is...Ch. 3.5 - What are the domain and range of each relation? Is...Ch. 3.5 - What are the domain and range of each relation? Is...Ch. 3.5 - Prob. 10ECh. 3.5 - What are the domain and range of each relation? Is...Ch. 3.5 - Prob. 12ECh. 3.5 - What are the domain and range of each relation? Is...Ch. 3.5 - Prob. 14ECh. 3.5 - Prob. 15ECh. 3.5 - Prob. 16ECh. 3.5 - Determine whether the graph represents a function.Ch. 3.5 - Determine whether the graph represents a function.Ch. 3.5 - Determine whether the graph represents a...Ch. 3.5 - Determine whether the graph represents a function.Ch. 3.5 - Determine whether the graph represents a function.Ch. 3.5 - Determine whether the graph represents a...Ch. 3.5 - Determine whether the graph represents a function.Ch. 3.5 - Determine whether the graph represents a function.Ch. 3.5 - Determine whether the graph represents a...Ch. 3.5 - Prob. 26ECh. 3.5 - Given the function defined by , find the...Ch. 3.5 - Prob. 28ECh. 3.5 - Given the function defined by , find the...Ch. 3.5 - Prob. 30ECh. 3.5 - Given the function defined by h ( x ) = 3 4 x + 1...Ch. 3.5 - Prob. 32ECh. 3.5 - Prob. 33ECh. 3.5 - Prob. 34ECh. 3.5 - Given the function defined by r ( x ) = 2 x 2 − 4...Ch. 3.5 - Prob. 36ECh. 3.5 - Given the function defined by , find the...Ch. 3.5 - Prob. 38ECh. 3.5 - Given the function defined by t ( x ) = x 3 − 3 x...Ch. 3.5 - Given the function defined by t ( x ) = x 3 − 3 x...Ch. 3.5 - Given the function defined by t ( x ) = x 3 − 3 x...Ch. 3.5 - 42. If , find Ch. 3.5 - 43. If , find Ch. 3.5 - Prob. 44ECh. 3.5 - 45. If , find g (2). Ch. 3.5 - Prob. 46ECh. 3.5 - Find the range of the function for the given...Ch. 3.5 - Prob. 48ECh. 3.5 - Find the domain of the function for the given...Ch. 3.5 - Prob. 50ECh. 3.5 - Prob. 51ECh. 3.5 - Prob. 52ECh. 3.5 - Prob. 1QQCh. 3.5 - Prob. 2QQCh. 3.5 - Prob. 3QQCh. 3.5 - Prob. 4QQCh. 3.6 - Graph each function. f ( x ) = 3 4 x + 2Ch. 3.6 - Prob. 2ECh. 3.6 - Graph each function. 3. Ch. 3.6 - Prob. 4ECh. 3.6 - Prob. 5ECh. 3.6 - Prob. 6ECh. 3.6 - Wildlife Biologist Ning is a wildlife biologist...Ch. 3.6 - Insulation in a House The R value of insulation in...Ch. 3.6 - Graph each function. 9. Ch. 3.6 - Prob. 10ECh. 3.6 - Prob. 11ECh. 3.6 - Prob. 12ECh. 3.6 - Graph each function. 13. Ch. 3.6 - Prob. 14ECh. 3.6 - Prob. 15ECh. 3.6 - Prob. 16ECh. 3.6 - Prob. 17ECh. 3.6 - Prob. 18ECh. 3.6 - Graph each function. 19. Ch. 3.6 - Prob. 20ECh. 3.6 - Graph each function. 21. Ch. 3.6 - Prob. 22ECh. 3.6 - Prob. 23ECh. 3.6 - Prob. 24ECh. 3.6 - Prob. 25ECh. 3.6 - Prob. 26ECh. 3.6 - In each of the following problems, a table of...Ch. 3.6 - Prob. 28ECh. 3.6 - Prob. 29ECh. 3.6 - Prob. 30ECh. 3.6 - In each of the following problems, a table of...Ch. 3.6 - Prob. 32ECh. 3.6 - Computer Manufacturing The following table shows...Ch. 3.6 - Prob. 34ECh. 3.6 - Prob. 35ECh. 3.6 - Prob. 36ECh. 3.6 - Prob. 37ECh. 3.6 - Prob. 38ECh. 3.6 - Prob. 1QQCh. 3.6 - Prob. 2QQCh. 3.6 - Prob. 3QQCh. 3.6 - Concept Check Explain how you would find f ( 1 4 )...Ch. 3 - Graph the straight line determined by each of the...Ch. 3 - Graph the straight line determined by each of the...Ch. 3 - Prob. 3RPCh. 3 - Prob. 4RPCh. 3 - Prob. 5RPCh. 3 - Prob. 6RPCh. 3 - Prob. 7RPCh. 3 - 8. Find the slope of a line perpendicular to the...Ch. 3 - 9. A line has a slope of and a y-intercept of (0,...Ch. 3 - Find the standard form of the equation of the line...Ch. 3 - 11. Find the standard form of the equation of the...Ch. 3 - 12. Computer Company Profit A computer company's...Ch. 3 - In exercises 13 - 16, find an equation of the line...Ch. 3 - In exercises 13 - 16, find an equation of the line...Ch. 3 - Prob. 15RPCh. 3 - In exercises 13 - 16, find an equation of the line...Ch. 3 - In exercises 17 - 18, find the slope and...Ch. 3 - In exercises 17 -18, find the slope and...Ch. 3 - Prob. 19RPCh. 3 - Graph the region described by the inequality. 20....Ch. 3 - Graph the region described by the inequality. 3 x...Ch. 3 - Graph the region described by the inequality. x ≤...Ch. 3 - Prob. 23RPCh. 3 - Prob. 24RPCh. 3 - What is the domain and range of each relation? Is...Ch. 3 - What is the domain and range of each relation? Is...Ch. 3 - Determine whether the graph represents a function.Ch. 3 - Determine whether the graph represents a function.Ch. 3 - If f ( x ) = − 2 x + 10 , find f ( − 1 ) and f ( −...Ch. 3 - If h ( x ) = x 3 + 2 x 2 − 5 x + 8 , find h ( − 1...Ch. 3 - Graph each function. f ( x ) = 2 | x − 1 |Ch. 3 - Prob. 32RPCh. 3 - Prob. 33RPCh. 3 - Prob. 34RPCh. 3 - Prob. 35RPCh. 3 - Prob. 36RPCh. 3 - Complete the table of values for each...Ch. 3 - 38. Find the slope and y-intercept of . Ch. 3 - A line n is perpendicular to the line passing...Ch. 3 - A line p is parallel to the line passing through...Ch. 3 - Find the standard form of the equation of the line...Ch. 3 - 42. Find an equation of the line parallel to and...Ch. 3 - Find the slope-intercept form of the equation of...Ch. 3 - Prob. 44RPCh. 3 - Prob. 45RPCh. 3 - Prob. 46RPCh. 3 - Prob. 47RPCh. 3 - Prob. 48RPCh. 3 - Prob. 1TCh. 3 - Prob. 2TCh. 3 - Prob. 3TCh. 3 - Prob. 4TCh. 3 - Find the slope of the line passing through ( 2 , −...Ch. 3 - Prob. 6TCh. 3 - Prob. 7TCh. 3 - Prob. 8TCh. 3 - Prob. 9TCh. 3 - Write an equation of the horizontal line passing...Ch. 3 - Prob. 11TCh. 3 - Prob. 12TCh. 3 - Prob. 13TCh. 3 - Prob. 14TCh. 3 - 15. If , find f . Ch. 3 - Prob. 16TCh. 3 - Prob. 17TCh. 3 - Prob. 18TCh. 3 - Prob. 19TCh. 3 - Prob. 20TCh. 3 - Prob. 21TCh. 3 - Prob. 1CTCh. 3 - Evaluate the expression. 3 ( 4 − 6 ) 2 + 16 + 12 ÷...Ch. 3 - Prob. 3CTCh. 3 - Prob. 4CTCh. 3 - Prob. 5CTCh. 3 - Prob. 6CTCh. 3 - Prob. 7CTCh. 3 - Prob. 8CTCh. 3 - Prob. 9CTCh. 3 - Prob. 10CTCh. 3 - Prob. 11CTCh. 3 - Prob. 12CTCh. 3 - Prob. 13CTCh. 3 - Prob. 14CTCh. 3 - Prob. 15CTCh. 3 - Prob. 16CTCh. 3 - Prob. 17CTCh. 3 - Prob. 18CTCh. 3 - Prob. 19CTCh. 3 - Prob. 20CTCh. 3 - Prob. 21CTCh. 3 - Prob. 22CTCh. 3 - Prob. 23CTCh. 3 - Prob. 24CTCh. 3 - Prob. 25CT
Knowledge Booster
Background pattern image
Algebra
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, algebra and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
PREALGEBRA
Algebra
ISBN:9781938168994
Author:OpenStax
Publisher:OpenStax
Text book image
College Algebra (MindTap Course List)
Algebra
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:Cengage Learning
Text book image
Intermediate Algebra
Algebra
ISBN:9780998625720
Author:Lynn Marecek
Publisher:OpenStax College
Text book image
Trigonometry (MindTap Course List)
Trigonometry
ISBN:9781337278461
Author:Ron Larson
Publisher:Cengage Learning
Text book image
Elementary Algebra
Algebra
ISBN:9780998625713
Author:Lynn Marecek, MaryAnne Anthony-Smith
Publisher:OpenStax - Rice University
Text book image
Intermediate Algebra
Algebra
ISBN:9781285195728
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Cengage Learning
SEE MORE TEXTBOOKS
Correlation Vs Regression: Difference Between them with definition & Comparison Chart; Author: Key Differences;https://www.youtube.com/watch?v=Ou2QGSJVd0U;License: Standard YouTube License, CC-BY
Correlation and Regression: Concepts with Illustrative examples; Author: LEARN & APPLY : Lean and Six Sigma;https://www.youtube.com/watch?v=xTpHD5WLuoA;License: Standard YouTube License, CC-BY