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no
JPEG
The answer to this question would depend on the source you are exporting. You can export data from Excel to a text file in a variety of formats. Just Save As and select the format you prefer.
True. The product of 21 negative numbers will be negative.
TRUE
No
It is true.
True
True
im pretty sure its true sorry if its wrong
Most of the time if you first open the correct application, you can then use it to open a file that is of the correct format, even if the file type is not correctly associated with the extension. On the other hand if you click directly on the file and the file type is not associated with the correct application, it usually will not open - or at the very least will give you weird results when it opens up with the wrong application.
No, that is not true.