Let * be a binary operation on R given by
x * y = x + y - xy, ∀ x, y ∈ R.
(i) Determine whether * is commutative.
(ii) Determine whether * is associative.
(iii) Show that R has an identity with respect to *.
(iv) Determine which elements of R have inverses with respect to *.
Need some help with this please