Quadrilateral ABCD has vertices at A(-4,2), B(-1,6), C(7,0), and D(4,-4). Use of the accompanying grid is optional. (a) Find the midpoint of each of ABCD's diagonals, i. e. AC and BD. What kind of special quadrilateral can we conclude ABCD is based on this information? [3 points]

(b) Find the slope of AB and the slope of BC. What kind of special quadrilateral can we conclude ABCD is based on this information and what we found in (a)?

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