Answer:
10 months
Step-by-step explanation:
Because he was at $-1,000 and he deposited $100 a month that he earns from watching the dogs so it took him 10 months to realize that his bank account is now at $0
The point-slope form:

- given point
- given slope
The standard form:

<em>use distributive property</em>
<em>add
to both sides</em>
<em>subtract
from both sides</em>
<em>change the signs</em>

Given the recursive formula, each terms is five time the previous one.
This means that:
is 5 times
, which means 
- in turn,
is 5 times
, so we have
. This means that 
- Finally,
So, substituting this back gives

In general, since you have
, each time you compute a new term you multiply by a factor of 5, so if
, you have

1. $9500 because 10*950=9500
2. $95 because 950/10=95
( can explain further )