Consider this scenario:

You have to finish shopping for your child's $1$st birthday party, but you forgot your credit card in your home. As a result, you go into your local bank and join the queue for customer service. Like most banks, the queue is constructed so that the tellers are operating in a pooled queue.

This particular queue can serve about $129\mathrm{.}95$ customers per hour and approximately $200\mathrm{.}9$ customers arrive into the queue per hour.

The queue growth rate is about$\_\_\_\_\_\_$ customers per hour. This is a $\_\_\_\_\_\_\_\_$ slope.