Given:
The mathematical sentences in the given options.
To find:
Which of the Mathematical sentences below is/are equations?
Solution:
Equation: An equation is a mathematical sentence which contains two expressions and an equals sign "=".
Inequality: An inequality is a mathematical sentence which contains two expressions and an inequality sign ">, <, ≤, ≥".
From the given options it is clear that the options (i) and (ii) contains equals sign "=". So, (i) and (ii) are equations.
The options (iii) and (iv) contains inequality sign ">" and "<" respectively. So, (iii) and (iv) are inequalities.
Therefore, the correct options are (i) and (ii).