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You are given the expression 36x^4y³ - 16x³y.
Part A: Find a common factor for the expression that has a coefficient other than 1 and that contains at least one variable. (1 point)
Part B: Explain how you found the common factor. (1 point)
Part C. Rewrite the expression using the common factor you found in Part A. Show every step of your work. (2 points)