Find the coordinates of the intersection of the diagonals of parallelogram wxyz with the following vertices: w (-1, 7), x (8, 7), y (6, -2) and z (-3, -2)
a. (1.5, -2)
b. (7, 2.5)
c. (2.5, 2.5)
d. (3.5, 7)

The intersection of the diagonals of a parallelogram is always the midpoint of each of the diagonals, which means all we have to do is grab two opposite vertices and average their coordinates. 

Let's use W and Y. 

(-1 + 6)/2 = 2.5 
(7 + -2)/2 = 2.5 

So our point is (2.5,2.5) 

We could also use X and Z. 
(8 + -3)/2 = 2.5 
(7 + -2)/2 = 2.5 

Again, we get (2.5,2.5)

Band c because if a graph has 3 negative parts and only 1 positive part it would be able to go in between the positive and negitive