Trisha needs to make at least 50 gift bags for an event. each gift bag will contain at least 1 thumb drive or 1 key chain. she wants to use at least 5 times as many key chains as thumb drives. she has 25 thumb drives and 200 key chains. let x represent the number of key chains. let y represent the number of thumb drives. which inequalities are among the constraints for this situation? select each correct answer. a. x+y≥50 b. x≤5y c. x≥5y d. x+5y≤50