Final answer:
The inequality to represent the situation where the temperature in a freezer must be at most -10°F is t <= -10.
Step-by-step explanation:
To represent the situation where the temperature in a freezer must be at most -10°F, we can use the inequality: t <= -10. In this inequality, 't' represents the temperature in the freezer, and the symbol '<=' indicates 'less than or equal to'.
Therefore, any temperature less than or equal to -10°F would satisfy this condition.