Well I suppose it would depend on what you have on your hard drive. If you have background applications that are using the computers memory without your knowledge, a clear drive would result in your performance improving. So I would say in general, clearing your drives would indeed make your computer faster.
The answer is spreadsheet. I just did this lesson and I got all of the answers right so I know it's correct.
True, sites such as kickstarter and just giving are fantastic examples of such.
