To represent the point 18.50 on a number line using inequalities, we can use the inequality x < 18.50.
This inequality states that x (representing any number on the number line) must be less than 18.50 for it to satisfy the condition.
Graphically, this inequality would be represented with an open circle on 18.50 (since the circle is not filled) and an arrow extending towards the left side of the number line.
Thus, the solution to this inequality is x < 18.50.