Answer:
Depends on how many PowerPoint files you want to store and how long they are. I'd recommend at least a 256GB hard drive to store your OS and software and then leave space for PowerPoints.
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.
