Which ordered pair is a reflection of (3,7) across the x-axis? O (-3,-7)
O (-3,7)
O (7-3)
O (3,-7)

answer:  

\boxed {\frac{1}{5}}  

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solution-

60 *   \frac{1}{5}   = 12

90 * \frac{1}{5} = 18

75 * \frac{1}{5} = 15

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hence, the answer would be \boxed {\frac{1}{5}}