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A strategy this student could use to prevent the same error in the future. A bag of apples comes with three red apples and one green apples. Use r to represent the total cost of the red apples and g to represent the cost of the green apples. Write and simplify an expression that represent the total cost of 7 bags of apples. Incorrect Work/Solution Identify and Explain the Error

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Explanation:

r = red apples, g = green apples, t = total

3r + g = t

7(3r + g = t)

21r + 7g = 7t

The cost of the apples was not included in the question, but you can multiply the total of one bag by 7, or the cost of the individual apples by the values above.