Since the common difference is -2, then you just have to subtract -2 from everything starting -10. So the answer or the first ten terms of the geometric sequence would be: -10, -8, -6, -4, -2, 0, -2, -4, -6, and -8. If you want to continue, simply subtract negative 2 in every succeeding number.
The answer is; "Quadrilateral ABCD is congruent to quadrilateral A′B′C′D′ because you can map quadrilateral ABCD to quadrilateral A′B′C′D′ using a translation 7 units to the right, which is a rigid motion."
