a. n=4i+5j+10k\bold{n}=4\bold{i}+5\bold{j}+10\bold{k}n=4i+5j+10k b. (5,0,0),(0,4,0)(5,0,0), (0,4,0)(5,0,0),(0,4,0), y (0,0,2)(0,0,2)(0,0,2) c.