To determine which transformation is equivalent to a clockwise rotation of 90 degrees, we can analyze each response:
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Rotation about the origin of 270 degrees clockwise: This is the same as a counterclockwise rotation of 90 degrees, so it's not equivalent.
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Rotation about the origin of 90 degrees counterclockwise: This is the opposite of a 90-degree clockwise rotation, so it's also not equivalent.
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Rotation about the origin of 270 degrees counterclockwise: A counterclockwise rotation of 270 degrees is equivalent to a clockwise rotation of 90 degrees (because a full circle is 360 degrees). So this one is equivalent.
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Rotation about the origin of 180 degrees counterclockwise: This rotation does not match a 90-degree clockwise rotation, so it's not equivalent.
Thus, the correct answer is:
Rotation about the origin of 270 degrees counterclockwise.