Change: direct mechanical or electrical model of the problem as a basis for computation. However, these were not programmable and generally lacked the versatility and accuracy of modern digital computers PC are also used for business not so much Mac computers.All this information is from Wikipedia   View changes from previous version. (Word count: 782)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 59)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 59)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 59)

Change: your mouse dosn't work, that means you have a glich in your computer. you need to turn off your computer. How to do that is, press and hold the power button on the computer untill it turnes off. If your keyboard is not working eathier do the same thing.   View changes from previous version. (Word count: 59)