I did figure out how to do the following
i
a = [6,-8,2];
b = [4 ,6,12];
c = a + b
quiver3(0,0,0,c(1),c(2),c(3));
However, how do i get them to all show up on the same plot? Right now it over writes itself and erases the vector every time i use the quiver command. How do i get multiple vectors to show on the same plot.