Why was the personal computer an important invention?

What operating system is a smartphone most likely to use? 1.bsd 2.mac os x 3.symbian 4.linux

Match each vocabulary word to its definition.1. desktoppicture used to represent acomputer application2. domainnetwork protectionsoftware code that can be viewed,3. iconmodified, and redistributed for freethe background screen on acomputer monitor4. url5. blogan online journalthe part of an internet address that6. firewallrefers to a group of computers on anetworkonline database of web pages7. intranetnetwork for use by an individual8. open address of a web page or9. wikiresource

Whats three fourths of 15(this is supposed to be in math but i clicked too fast)