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).
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
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.
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.
Yes, it's called Windows XP
78 divided by 8 (or 78/8) equals 9.75.
The value of 8 in 78 is 8.
yes
Yes, everyone that has Windows Phone 7 can download a string of updates through Zune (updates are installed cumulatively) leading to WP7.5. When Windows Phone 8 is released, you will get a toned down version of Windows Phone 8, called Windows Phone 7.8. This includes some key features such as the updated start screen, but not all of the features that come with WP8
78 times 8 is 969
9.75
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
decimal equivalent of 78 over 8 = 9.7578/8:= 78 ÷ 8= 9.75 in decimal