The vector a1 is in W=Span{a1,a2,a3} because a1 can be written as a linear combination c1a1+c2a2+c3a3 where c 1 comma c 2 comma and c 3 are scalars.c1, c2, and c3 are scalars. Thus, a1 is in W because a1=a1+a2+a3. (Simplify your answers.)