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To choose: a variable for the present age of a coin
And to write an equation which represents the information regarding the age at a particular day in terms of the present age
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Answer to Problem 25WE
The variable for present age of the coin is a
The equation representing the given information is
Explanation of Solution
Given Information:
A coin will attain an age of 50 years seven years from its present age.
Formula Used:
The following approach is used to obtain the equation connecting the present age and future age of the coin
a. Choosing a variable for the present age of the coin
b. Representing the given information that the coin will have a given age after some years from present by adding the present age to the number of years and equating it to the future age
The variable chosen can be assigned in the above expression to get the equation of age of coin
Calculation:
Let the present age of the coin be represented by the variable “ a ”
Based on this, the age after 7 years is given by a+7 . Now, it is given that the coin attains an age of 50 years after 7 years from its present age.
Therefore, the equation for the ages can be written as,
Chapter 1 Solutions
Algebra: Structure And Method, Book 1
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