Final answer:
The inequality to represent the situation where the temperature must be at most -10°F is written as T ≤ -10°F, where T represents the temperature in degrees Fahrenheit.
Step-by-step explanation:
To represent the situation where the temperature must be at most -10°F, you can use the following inequality:
T ≤ -10°F
Here, T represents the temperature in degrees Fahrenheit. This inequality means that the temperature can be -10°F or any temperature lower than that, but it cannot exceed -10°F. The '≤' symbol is used to indicate 'less than or equal to' which is the appropriate symbol to represent 'at most' in inequalities.
In a real-world context, imposing a maximum air temperature of -10°F for design purposes could be reasonable if the design is for environments where extreme cold conditions are expected or for materials that must withstand such low temperatures without failing.