Answer:
The coefficient of x is -8 it means the company ships 8 items each hour.

Explanation:
The given function is

where, "x" is the number of hours that elapse since opening.
In the given function 500 represents the initial inventory and coefficient of x represent rate of shipping per hour.
The coefficient of x is -8 it means the company ships 8 items each hour.
It the company ships for ten hours today, then the initial inventory for tomorrow is

The shipping rate doubles. So, the shipping rate for tomorrow is

The function g(x) to model tomorrow's inventory is

Therefore, the required function is g(x)=420-16x.