Answer:
1. Sports Team Shirt - Excludable / Rivalrous
2. Air we breathe - Non - Excludable / Non - Rivalrous
3. Atlantic Bluefin Tuna - Non -Excludable / Rivalrous
4. A Toll Road - Excludable / Non - Rivalrous
Explanation:
A rivalrous good is one in which usage, by an individual limits the ability of another to use the same good. Rival goods are tangible. This means that they can be held or touched. Examples in this category are; A sports team shirt and, the Atlantic Blue Fin Tuna. Eating a Tuna would limit access to another person, who wants to eat Tuna at that point in time. The same would apply to wearing a sports shirt.
A Non - Rivalrous good is one in which usage by an individual does not limit consumption by another. Most non - tangible goods are non -
rivalrous. Examples in this category are; the air we breathe, and the Toll Road. Almost anyone can access these.
Excludable goods are only used after payment for them has been made. Examples are the Toll Road and the Sports Team Shirt.
Non - Excludable goods can be used even when payment has not been made. Examples are Air and The Atlantic Blue Fin Tuna which anyone can access.
Answer:
a) 
b) 
c) For this case we have the total sales $ 15 millions after t =4 months
d) 
e) This value represent the increase in the amount of sales in millions after t=4 months
Explanation:
For this case we have the following function for the sales

Part a
For this case we want to find the derivate of S respect to t and we got:

Part b
For this case we want to find the value of S when t = 4 so if we replace we got:

Part c
For this case we have the total sales $ 15 millions after t =4 months
Part d
For this case we just need to replace t=4 in the derivate and we got:

Part e
This value represent the increase in the amount of sales in millions after t=4 months
Field-level briefings
your welcome
<span>Using your computer for non-work activities while you are being paid to work is known as </span>cyberloafing
Im thinking its the uk am i right