What do you mean? Oh oh oh I used to do this, what grade you it?
They will need 3 cars, but one of the cars will be having 3 passengers instead of 4. :)
The property x^axb makes it x^a+b so x^5x-2 ,
Therefore x^-10 is final
It will take them 10 days to have the same amount of credits.
The only thing I did was to keep adding what they where earning per day!
