Answer:
\(-a-r\) OR \(a+r\)
Step-by-step explanation:
First week cost of Isabelle:
2 bags of apples at a price of \(a\) each, so total cost is \(2a\)
3 bags of oranges at a price of \(r\) each, so total cost is \(3r\)
Sum of these two: \(2a+3r\)
Second week cost of Isabelle:
1 bag of apple at a price of \(a\) each, so total cost is \(a\)
2 bags of oranges at a price of \(r\) each, so total cost is \(2r\)
Sum of these two: \(a+2r\)
Depending on the price of bags of apples and oranges, the second week can cost more, or the first week's total could be more.
- If 2nd weeks total is more than 1st week's total:
The difference is 2nd week's total minus first week's total:
\((a+2r)-(2a+3r)\\=-a-r\)
- If 1st weeks total is more than 2nd week's total:
The difference is 1st week's total minus second week's total:
\((2a+3r)-(a+2r)\\=a+r\)
