Dis the midpoint of ce. e has coordinates (-3,-2), and d has coordinates (2 1/2, 1). find the coordinate of c.

Midpoint formula : (x1 + x2) / 2, (y1 + y2) / 2
(-3,-2)x1 = -3 and y1 = -2
(x,y)x2 = x and y2 = y
now we sub
(-3 + x) / 2, (-2 + y) / 2

(-3 + x) / 2 = 2 1/2
-3 + x = 5/2 * 2
-3 + x = 5
x = 5 + 3
x = 8

(-2 + y) / 2 = 1
-2 + y = 1 * 2
-2 + y = 2
y = 2 + 2
y = 4

so the coordinates of point C are : (8,4)

To the risk of sounding redundant.

How many groups are there?