use the midpoint formula to find endpoint c. A = (-3, 2) B is midpoint (5, -4). I know AB is I/2 of AC. I tried and got x= 14, y= -11. Correct? and how do you graph it? Thanks

let C be (a,b)

by the midpoint theorem we know:
(-3+a)/2 = 5 and (2 + b)/2 = -4
-3+a = 10 and 2+b = -8
a = 13 and b = -10

so A is (-3,2) , C is (13,-10), and the midpoint between them is B(5,-4)

You should have seen that your answer is incorrect as soon as you graphed it.
(I will assume you know how to plot points)