Peripheral Bus is not associated with the SATA function on a computer as they are not universal to each other. If you can go more into context, that would be great.
Answer:
missing quotation marks around a string literal
Answer:
previousAddition instance variable
Explanation:
In order to accomplish this you would need to add a previousAddition instance variable. In this variable you would need to save the amount that was added at the end of the process. Therefore, if a mistake were to occur you can simply call the previousAddition variable which would have that amount and subtract it from the total. This would quickly reverse the mistake, and can be easily called from the undo() method.
