All 3 Uses

dispose
in
The Elite, by Kiera Cass
(Edited)

And I have access to the answers of a thousand questions at my disposal.
p. 17.8

disposal = command
It seemed very easy for Maxon to give me things—to resurrect a holiday for my sake, to make sure I had the best of everything—because he had the entire world at his disposal.
p. 134.8
Silvia claimed she would be at our disposal, but I had a feeling asking for help would make her think we couldn't do a good enough job on our own, so that was out.
p. 145.2 *

Definitions:

(1) (dispose as in: dispose of the waste)
to throw away
(2) (dispose as in: dispose of the matter)
to settle something so it no longer requires attention
(3) (dispose as in: dispose of the assets)
sell or transfer to another
(4) (dispose as in: disposed the troops along...)
the arrangement, positioning, or use of things
This sense of dispose can be used in the form disposal to indicate that a person can use something as they wish -- as in:
- I am at your disposal.
- She has many assets at her disposal.
(5) (dispose as in: Is she disposed to help?)
inclined (with a tendency to; or in the mood to)

This is usually seen in the form "disposed to..." or "disposed toward..."
(6) (meaning too rare to warrant focus)
Less commonly, disposing of can imply killing someone.