Answer:
-7/10
Step-by-step explanation:
To find the slope of a line, you need to find the
between two points. I will be using the points (-3, 5) and (7, -2).
=
= 
= -7/10
1 whole and 1/3 is the answer
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.
I'm going to have to say C.
By the seventh week you both will have $148. Hope this helps!