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Math Question

Question 3 of 10 Lines \( c \) and \( d \) are perpendicular. If the slope of line \( c \) is \( -4 \), what is the slope of line \( d \) ? A. \( -4 \) B. \( \frac{1}{4} \) C. 4 D. \( -\frac{1}{4} \)

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