Challenge 2: Single vs Double Quotes — Possible Solution
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use strict;
use warnings;
use feature 'say';

my $x = 5;

say 'The value is $x';
say "The value is $x";

Output:
The value is $x
The value is 5

WHY THIS WORKS AS AN ANSWER
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Both lines reuse the exact same underlying string, "The value is $x",
differing only in quote style — isolating that single variable is
what makes the contrast the challenge asks for directly visible.

The single-quoted version reuses the chapter's own definition of
single quotes as "literal — nothing inside them is interpreted."
$x inside single quotes is just three literal characters ($, x), not
a variable reference at all, so it prints exactly as typed: "The
value is $x".

The double-quoted version reuses the chapter's own interpolation
behavior — inside double quotes, $x IS recognized as a variable
reference and replaced with its actual current value, 5, producing
"The value is 5".

They differ because quote style in Perl isn't just a stylistic
choice the way it often is in other languages — double quotes
actively trigger interpolation and escape-sequence processing, while
single quotes deliberately opt out of both, treating their contents
as plain, unprocessed text.