Answer :
The combination that is impossible for Katrina is 5 scoops of ice cream and 2 sudoku books.
Let's consider each combination:
1. 1 scoop of ice cream and 2 sudoku books:
- Cost of 1 scoop of ice cream: $4
- Cost of 2 sudoku books: $6 * 2 = $12
- Total cost: $4 + $12 = $16
This combination is possible within the budget of $30, so it is not impossible for Katrina.
2. 6 scoops of ice cream and 0 sudoku books:
- Cost of 6 scoops of ice cream: $4 * 6 = $24
- Cost of 0 sudoku books: $6 * 0 = $0
- Total cost: $24 + $0 = $24
This combination is possible within the budget of $30, so it is not impossible for Katrina.
3. 5 scoops of ice cream and 2 sudoku books:
- Cost of 5 scoops of ice cream: $4 * 5 = $20
- Cost of 2 sudoku books: $6 * 2 = $12
- Total cost: $20 + $12 = $32
This combination exceeds Katrina's budget of $30, so it is impossible for her.
4. 2 scoops of ice cream and 3 sudoku books:
- Cost of 2 scoops of ice cream: $4 * 2 = $8
- Cost of 3 sudoku books: $6 * 3 = $18
- Total cost: $8 + $18 = $26
This combination is possible within the budget of $30, so it is not impossible for Katrina.
Therefore, the combination that is impossible for Katrina is 5 scoops of ice cream and 2 sudoku books.
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