Think of sea level as 0 on number line
-13 + 6 - 15
Answer:
The amount of increase per
hour by $1.
Step-by-step explanation:
Julian charges $10 for every
hour he walks a dog.
He increases his fee by 10%
Now we have to find 10% of $10
Amount increased = 
So the amount increased by $1.
The amount of increase per
hour by $1.
4/7 is the answer.
I cant reall explain becuase it will take forever xD