Answer:
use the formula of centroid that is
= x1+x2+x3/3
X : the gas used by first car in 1 particular week
y : the gas used by second car in 1 particular week

Answer:
Step-by-step explanation:
I think your doing slope, so...
-2 - - 5 3
------------------ = --------------- = 1
0 - - 3 3
(simplifyed)
Find how far the car can travel on one gallon of gas, by dividing total miles by number of gallons:
105 miles / 7 gallons = 15 miles per gallon.
Now multiply that by the number of gallons to find total miles:
15 miles per gallon x 9 gallons = 135 total miles.