Find an equation for the perpendicular bisector of the line segment whose endpoints are
(
9
,
−
3
)
(9,−3) and
(
−
5
,
−
7
)
(−5,−7).

Problem 3 a bank charges a service fee of $7.50 per month for a checking account. a bank account has $85.00. if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative