Final answer:
The question deals with making purchases within a budget, using unit price comparisons. If two movies can be traded for one T-shirt, and the budget is $3.50, we cannot purchase the T-shirt if a single movie costs more than $1.75, as the T-shirt would then be out of our budget.
Step-by-step explanation:
The question posed relates to unit price comparison and decision-making based on budget constraints. In this scenario, we understand that some products, such as T-shirts and movies, have different costs. If we can trade two movies for one T-shirt, it implies that the cost of one T-shirt is equal to the cost of two movies. Therefore, if a T-shirt costs twice as much as a movie, and our budget limit is $3.50, we can determine the two items we cannot buy for less than $3.50 by comparing their unit prices to our budget.
Since we do not have the exact cost of a movie or a T-shirt, we cannot pinpoint the items that exceed the $3.50 limit. However, the concept explained is that if the price of one product is twice the price of another, and the second product costs more than $1.75 (half of $3.50), then we cannot buy the more expensive product within the given budget. Thus, we would not be able to purchase the T-shirt if the price of a movie is greater than $1.75.