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A teacher received the following answer to a quiz question in which the student was asked to simplify the expression in Step 1:


Step 1: −4(x − 15y) + 5(−4x − 6y)

Step 2: −4x − 15y − 20x − 30y

Step 3: −4x − 20x − 15y − 30y

Step 4: (−4x − 20x) + (15y − 30y)

Step 5: −24x − 15y


Part A: Identify the step where the student made a mistake and explain the specific error that was made. Support your answer using the correct vocabulary. (6 points)


Part B: How would you correct the mistake? Show all your work. (6 points)

Sagot :

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