15. Determine wheter the set is a vector space. The set of all fifth-degree polynomials with the standard operations. AXIOMS 1.u+v is in V 2.u+v=v+u 3.u+(v+w)=(u+v)+w 4.u+0=u 5.u+(-u)=0 6. cu is in V 7.c(u+v)=cu+cv 8.(c+d)u=cu+cd 9.c(du)=(cd)u 10.1(u)=u the back of my book says that axioms 1,4,5, and 6 fail. I dont know why 4,5,and 6 fail. Can anyone help me?