The sentence that contains an adverbial clause is:
"Whether students have enough time to rest depends on how much homework they’re assigned."
The clause "whether students have enough time to rest" functions as a noun clause, and the clause "how much homework they’re assigned" is also a noun clause. However, the emphasis on "whether" indicates a condition related to the statement made, giving it an adverbial quality as it provides context for the main clause.
If you're looking strictly for an adverbial clause, "before you go to the theater" in the sentence "Make sure to print out your ticket before you go to the theater." is an adverbial clause specifying when to print out the ticket.
So, both sentences can involve clauses that serve adverbial functions depending on interpretation, but "Make sure to print out your ticket before you go to the theater," clearly has an adverbial clause.