The blue-throated hummingbird's heart beats at up to 1,260 beats per minute. At
that rate, the hummingbird's heart rate
could be 21 beats per -

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 if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative