Question 836276
We use the midpoint formula, but in reverse to get the following


(x+8)/2 = 4


x+8 = 2*4


x+8 = 8


x = 8-8


x = 0


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(y+1)/2 = -5


y+1 = 2*(-5)


y+1 = -10


y = -10-1


y = -11


So the point R is <font color="red">(0,-11)</font>