Which of the points below, when plotted on the graph, would connect with the other two points to form an obtuse triangle? A.
(9,6)
B.
(5,8)
C.
(8,3)
D.
(7,1)

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.