Classify into monomials, binomials and trinomials:
(i) 4 y - 7 x
(ii) y2
(iii) x + y - xy
(iv) 100
(v) ab - a - b
(vi) 5 - 3t
(vii) 4 p2q - 4pq2
(viii) 7mn
(ix) z2 - 3 z + 8
(x) a2 + b2
(xi) z2 + z
(xii) 1 + x + x2
Clasified minomials, binomials, trinomials