If you are trying to build credit by using a credit card, each time you make a purchase with the credit card, deduct that amount from your checking account. That way, when your credit card bill is due, you will have enough to pay the credit card off in full. Kathy Lehner
is going to start doing this. She plans on paying her credit card bill in full this month. How much does she owe with a 9% APR and the
following transactions? (Round your answer to the nearest cent.)
31-day billing cycle
10/1 Previous balance
$ 1,178
Credit
10/12 Charge: King Soopers
10/15 Payment
10/25 Charge: Delta
10/30 Charge: Holiday Fun
10/3
$65
cr.
$162
$450 cr.
$335
$75
Amount owed

The biologist has a second culture to examine. she knows that the population of the culture doubles every 15 minutes. after 1 hour and 15 minutes, her assistant found that 80,000 bacteria were present. a) what was the size of the initial population? b) predict the size of the culture at t=3 hours. what was the size of the population at 40 minutes? explain and justify your answers. c) create a graph of the population as a function of time. find an equation that can be used to predict the size of the population at any time t. d) examine the rate at which the bacteria culture is growing. how fast is the culture growing after 1 hour? after 1.5 hours? after 2 hours? use a time interval of h = 0.01 hours to estimate these rates. interpret these rates in terms of the context of the problem situation. how do these three rates compare?