Line 2 for the first question should be:
foreach(@this_array) {
... because @this_array and $this_array are different and unrelated variables.
And for the other question, line 2 should be:
%car_hash = reverse(%car_hash);
... again because $car_hash and %car_hash are different variables, but also because reverse() returns the reversed hash, so you need to assign it somewhere.
I'm surprised the exam questions contain such basic errors.
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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