The main function you will use is.... Type SUM= in all caps into a cell and then you can control click cells to add them together. You can also add PEMDAS properties to do calculations withing it.
Answer:
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Record companies lose money because people download songs for free.
Answer: Multi-user issue
Explanation: A database management system scheme can have multi-user issue when the designing of the system is not made properly. The multi user issue rises when the users concurrently access the data from the database and related error get invoked due to some reason like repeatable reading issue, serialization, etc.
The reading problem is usually can be related to reading of the database in uncommitted manner, uncommitted reading, repeatedly reading etc.Thus, Cora and Owen are accessing the database concurrently which can create multi-user issue.