Concept explainers
a.
To find the range K has left to spend on music and apps in the last month of the year.
a.
Answer to Problem 30PPS
From $0 to $45.50.
Explanation of Solution
Given: Each year K receives a $150 gift card to download music and apps onto his phone. The card expires in one year. He spent with in $3 of his monthly allowance for each of the 11 months.
Calculation:
Let x be how much he spent each of the 11 months of the year. If his card is for $150 , assume his monthly allowance is
He spent within $3 of his monthly allowance for the first 11 months so
Now multiply all sides of this inequality by 11 to find the range of the total amount he spent over the first 11 months:
Since $150 , the maximum he spent can be changed to $150 so he spent a total of
b.
Describe your solution process.
b.
Explanation of Solution
Given: Each year K receives a $150 gift card to download music and apps onto his phone. The card expires in one year.
Calculation:
Since $150, the maximum he spent can be changed to $150 so he spent a total of
It was assumed that K’s monthly allowance was the same amount of $12.50 each month. If his monthly allowance varied each month, the monthly allowance of each month and more inequalities would have been needed to find the range of his total spending after 11 months.
c.
The assumption could be made.
c.
Explanation of Solution
It was assumed that K’s monthly allowance was the same amount of $12.50 each month. If his monthly allowance varied each month, the monthly allowance of each month and more inequalities would have been needed to find the range of his total spending after 11 months.
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