The terms of each of the given algebraic expressions are as follows.
(i) 3x is the only term of the given algebraic expression.
(ii) 2x and -3 are the terms of the given algebraic expression.
(iii) 2x2 and -7 are the terms of the given algebraic expression.
(iv) 2x2, y2, -3xy and 4 are the terms of the given algebraic expression.