Answer: -5/3
Step-by-step explanation:
Use the slope formula:
You substitute the numbers in and subtract to get -5/3.
I would say there would be 5 itineraries ie one each for Thailand, Singapore, Hong Kong, Laos and Bali though for the countries Thailand and Laos there may be more than one stop so there would be a minimum of 5 itineraries.
The answer is the a next to the 5