To ride a roller coaster, a visitor must not be less than 50 inches tall. Use h to represent the height (in inches) of a visitor able to ride.

This information is telling us that a visitor must be equal to or taller than 50in.

We can represent this with an inequality symbol.

We will use H to represent the height of the visitor.

H ≥ 50

All this means is that height of visitors must be equal to or more than 50.