The equation x3 - 2x = 68
has a solution between 4 and 5
Use a trial and improvement method to find
this solution.
Give your answer correct to 1 decimal place.
You must show all your working.

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 if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative