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