Concept explainers
a.
To write: An expression that represents Alexandria’s age in terms of Sara’s age.
a.
Answer to Problem 13STP
Alexandria’s age is represented by
Explanation of Solution
Given information:
Alexandria recently had a birthday. Her age is now four less than twice her younger sister Sara’s age. The symbol srepresent Sara’s age in years.
Sara’s age is syears .
The term “twice Sara’s age” denotes the expression
The term “four less than twice Sara’s age” denotes “subtraction by
Thus, “four less than twice her younger sister Sara’s age” denotes the expression
Conclusion:
Alexandria’s age is represented by
b.
To calculate:Alexandria’s age.
b.
Answer to Problem 13STP
Alexandria is 8 years old.
Explanation of Solution
Given information:
Alexandria recently had a birthday. Her age is now four less than twice her younger sister Sara’s age. Suppose Sara is 6 years old.
Calculation:
Alexandria’s age is given by the expression
Sara is 6 years old.
Then, putting
Thus, age of Alexandria is 8 years.
Conclusion:
Alexandria is 8 years old.
Chapter 2 Solutions
Pre-Algebra Student Edition
Additional Math Textbook Solutions
Elementary Algebra
Linear Algebra and Its Applications (5th Edition)
College Algebra
College Algebra (7th Edition)
- Algebra and Trigonometry (6th Edition)AlgebraISBN:9780134463216Author:Robert F. BlitzerPublisher:PEARSONContemporary Abstract AlgebraAlgebraISBN:9781305657960Author:Joseph GallianPublisher:Cengage LearningLinear Algebra: A Modern IntroductionAlgebraISBN:9781285463247Author:David PoolePublisher:Cengage Learning
- Algebra And Trigonometry (11th Edition)AlgebraISBN:9780135163078Author:Michael SullivanPublisher:PEARSONIntroduction to Linear Algebra, Fifth EditionAlgebraISBN:9780980232776Author:Gilbert StrangPublisher:Wellesley-Cambridge PressCollege Algebra (Collegiate Math)AlgebraISBN:9780077836344Author:Julie Miller, Donna GerkenPublisher:McGraw-Hill Education