Answer:
$5879.4
Step-by-step explanation:
the monthly expense of the car is $489.95
no. of months=12
therefore, the expense= 489.95×12
=$5879.4
hope im right but i think it 1 sorry if im wrong
Answer:

Step-by-step explanation:
Consider the given differential equation is



Taking all variables on right sides.


Let as assume,
and 
Find partial derivatives
and 
and 
Since
, therefore the given differential equation is exact.
The solution of the exact differential equation is






Answer: Sally walked 3 minutes faster per mile
Hope it helped!