What is the answer for this

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

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?