Final answer:
The inequality representing Stephan's situation of buying at least $500 worth of phones for his employees is 3A + 2I >= 500, where A is the cost of an Android phone and I is the cost of an iPhone.
Step-by-step explanation:
When Stephan is buying company phones for his employees, and he wants to spend at least $500, you can represent the number of phones he can buy with the following inequality. Let A be the cost of one Android phone and I be the cost of one iPhone. The inequality to represent Stephan's situation would be:
3A + 2I ≥ 500
This inequality states that the cost of three Android phones plus the cost of two iPhones should be at least $500. To determine the maximum number of phones Stephan can buy, you would need to know the prices of the Android phones and iPhones he is considering.