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For question 16, based on the given points A(0,-3), B(6,-3), C(9,1), and D(3,1), we can determine that the lengths of each of the sides are not congruent. Therefore, the shape cannot be a square. The correct answer is: no; because the lengths of each of the sides are not congruent.
For question 17, we can determine the slopes of the opposite sides. The slope of AB is 0 and the slope of CD is also 0, therefore the slopes of the opposite sides are the same. This means that the shape can be a parallelogram. The correct answer is: yes; the slopes of the opposite sides are 4/3 and 0 respectively.
For question 18, based on the given information, it is not possible to determine whether the figure is a square, parallelogram, rectangle, or trapezoid. Therefore, there is not enough information to answer this question. The correct answer is: There is not enough information to tell.