There isn't any Windows 7.8, but if you were referring to Windows Phone 7.8, it cannot be updated to Windows Phone 8 (note that I did not say Windows 8 because Windows 8 is for laptops, desktops and some tablets).
You do not have to upgrade to Windows 8 at all, but some people perfer to be updated with the latest softwares.
Windows 8.1 is the updated version of Windows 8 with few changes: - Start button is back - Search is even better - By default desktop is back - Speed is awesome
You can't download Windows Movie Maker on a Windows 8 tablet right now because Microsoft doesn't have an app yet for it. But the Microsoft company may have an app soon for it so this answer may be updated when they do have it.
The reason why Windows 8 apps may stop working is that they have not been updated. You may be forced to reinstall the apps in order to get them working again.
Yes, it's called Windows XP
78 divided by 8 (or 78/8) equals 9.75.
The value of 8 in 78 is 8.
No, 8 is not greater than 78. In numerical terms, 78 is greater than 8 because the value of 78 is higher than the value of 8 on the number line. This can be represented as 78 > 8 in mathematical notation, indicating that 78 is indeed greater than 8.
9.75
78 times 8 is 969
5 st 8 lbs = 78 lb5 st 8 lbs = 78 lb5 st 8 lbs = 78 lb5 st 8 lbs = 78 lb5 st 8 lbs = 78 lb5 st 8 lbs = 78 lb
yes