Answer: Without GUI's being developed, we most likely would still be using terminal systems. Terminals require command/text input rather than mouse or other input. The invention of GUI's enabled people to use simpler input methods, rather then clunky text input systems. To sum, GUI's simplified the computer experience as we know today.
Hope this helped :)
Answer:
I am not sure can you explain a little more
In excel spreadsheets, Sidney
need to consider specifying relationships between the information you have
stored in your spreadsheets when creating formulas. The elements that will help
you understand using spreadsheet are the constants, operators, references and
functions. This will enable her to use the formulas, without hassle in
spreadsheets.
It depends on personal tastes and what it's applied on.
For example: I like Blue. I think Blue is cool! But, I also think red is cool, on a sports car. I think it would have to be Red, but thats what I think. The same with orange. Green for a T-Shirt is cool as well!
Remember that if you want to find out what color someone likes, just ask them. Generally though, Red is considered to be cool for most things.