This is most likely a rectangular prism, C.
Answer: Both 4 barrels and 7 barrels of beer per crates of olives will allow both Germany and Portugal to gain from trade.
Step-by-step explanation: For every 1 crate of olives produced by Portugal, they will not be able to produce 3 barrels of beer in return. Therefore, for portugal to trade a crate of olives for barrels of beer more than 3 means they are gaining on the trade, in this case, they gain 1 (option A) and 4(option B) extra barrels of beer for every crate of olive traded with Germany. Likewise Germany gains in both cases because any exchange of barrels of beer that is less than 11 barrels of beer to a crate of olives is a gain for Germany. Therefore both 4 barrels and 7 barrels for a crate of olives will lead to both countries gaining.
The answer is: 
The explanation is shown below:
1- You have the following expression given in the exercise:
2- When you multiply signs, you obtain:
3. Now, you must add like terms, as following:
4. Therefore, you have that the expression simplified is:
