Make a conjecture about the next item in the sequence.

1, 4, 16, 64, 256

a. 122 b. -480 c.-488 d. 116

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 if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative