If 6 books cost $42, how much would 15 books cost? The cost ...

Question Analysis
This question tests the student's ability to apply proportions to a real-world scenario involving the cost of books.

Key Concept Explanation
Proportions are used to solve problems where two ratios are equal. In this case, the ratio of the number of books to the cost is given, and the student needs to find the cost for a different number of books.

Step-by-step Solution
1. Set up the proportion:
2. Cross-multiply:

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Algebra-1

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