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There is no PowerPoint control center in Excel. MS PowerPoint is a presentation application. MS Excel is a spreadsheet.
The answer can be found at http://office.microsoft.com/en-us/powerpoint/HA011327531033.aspx
The idea is to search online sources (I would suggest you start at Wikipedia) about "arithmethic progression", and write the main ideas in the PowerPoint presentation.
A scale that is nonlinear. ~
That so depends on the presentation and content. Typically, for engineering presentations, I assume 1-3 minutes per slide with average of 2 minutes per slide, for a 20-30 slide presentation. If you have only 5 or 10 minutes, about 5 to 10 slides.