Move the sliders [color=#0000ff]a[/color] and [color=#0000ff]d[/color] to change the AP.[br]Move the slider [color=#ff0000]n[/color] to find a specific T[sub]n[/sub].[br]Move the slider [color=#ff0000]n[/color] to find the sum of the AP to a specific number of terms, S[sub]n[/sub].