Quadrilateral abcd is a parallelogram if its diagonals bisect each other. prove that quadrilateral abcd is a parallelogram by finding the value of x. a) x = 2 b) x = 3 eliminate c) x = −9 2 d) x = −3 4

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.