Final answer:
The student's mathematical question about representing Deshaun's exercise time in an inequality can be expressed as 't ≥ 40', where t is the time in minutes that Deshaun exercises per day.
Step-by-step explanation:
Deshaun exercises no less than 40 minutes per day. This inequality can be represented mathematically using a variable t to indicate Deshaun's amount of exercise in minutes per day. The mathematical expression for this description would be t ≥ 40, which reads as 't is greater than or equal to 40.'