Evalute each of the following:
(i) +
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(x)
(xi) -
(i) -
=
(ii) +
(iii) -
(iv) -2 -
(v) +
(vi) +
(vii) +
(viii) -
(ix) +
(x) -
(xi) +