(PLEASE HELP! ITS URGENT) Move all expressions whose product is negative to the box.
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Will give brainliest sum of arithmetic series (sigma notation) find the numerical answer to the summation given below. (image shown below)

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

Which situation is an example of an observational study?