Which sequence of two transformations maps ABC to A'B'C? ☁︎
a: a rotation 90° counterclockwise about the origin, then a reflection over the line y= -x
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b:A translation 7 units to the right then a reflection over the x-axis
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c:A rotation 90° clockwise about the origin, then a reflection over the x-axis
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d:A reflection over the y -axis , then a translation 8 units down
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