
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
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