Explain why it is important to know the history of science

Who invented the tv .hint it was 2 people

Rachel completed typing an official document with a word processing program. she wants to make sure that her document has no typographical errors. she also wants all headings to have the same font. which features in a word processing program should she use? rachel should use the feature in a word processing program to find typographical errors. she should apply to have uniform headings.

How would you categorize the software that runs on mobile devices? break down these apps into at least three basic categories and give an example of each.