slope of (11.4) and (15,-6)

The slope between the points (11,4) and (15,-6) can be found using the formula:

m = (y2-y1) / (x2-x1)

Substituting the values, we get:

m = (-6-4) / (15-11)
m = (-10) / (4)
m = -2.5

Therefore, the slope is -2.5.