Time=10 trips * (7/12 hours/1 trip)=70/12 hours=35/6 hours.
1 hour=60 minutes, so:
35/6 hours *(60 minutes / 1 hour)=350 minutes
Answer: She spend communting 350 minutes.
I'm guessing the "regions" are the circles. The one needing the most water conservation devices is the circle in the far left, near California.
The standard form is
-x + y = 19
