Answer: Close or disable all unused running apps.
Explanation: when unused apps keep runningon the device, it will make the device to keep lagging, thereby reducing it efficiency. But once those apps are disabled or closed and the system is probably restarted, the device will regain it efficiency back.
Answer:
Answer is Mobile commerce
Answer: False
Explanation: they remain in the same area
A .xlsx file tells you that the file is an Excel workbook that utilizes XML files to create the various spreadsheets as well as macros and other hidden codes used to perform certain functions (which is why there's an X at the end; older .xls files had no indication of this external code being present, which is why they're almost never recommended for modern use).
