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Which statement explains how you could use coordinate geometry to prove that quadrilateral abcd is a parallelogram? -5 -4 -3 -2 -1 t 1 2 3 4 prove that all sides are congruent and have slopes that are opposite reciprocals prove that segments ad and ab are congruent and parallel prove that opposite sides are congruent and have equal slopes prove that segments bc and cd are congruent and parallel

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels