Challenge 1: The Minimum Keyframes Needed for a Smooth Slide Across 48 Frames — Solution Walkthrough

The answer:

Per this chapter's own material, only two keyframes are actually
needed — one at frame 1 recording the object's starting location, and
one at frame 48 recording its ending location. Blender's own
interpolation calculates every value in between automatically,
producing smooth, continuous motion without needing any keyframes on
the frames in between.

Why more keyframes aren't required for this specific motion:

Since the object is meant to simply slide smoothly from one location
to another with no additional pauses, direction changes, or other
special moments along the way, there's no additional information for
extra keyframes to actually add. Two clearly defined endpoints are
sufficient to describe the entire motion.

Why this matches this chapter's own broader point:

Per this chapter's own material, a location keyframed at frame 1 and a
different location keyframed at frame 48 doesn't require 47 separate
keyframes in between — this is exactly the scenario this chapter uses
to introduce interpolation in the first place.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that a simple two-point slide is correctly
matched to exactly two keyframes, relying on automatic interpolation
rather than manually specifying every intermediate frame.