I have another three sentence in grammar that I just need to know if I am right or wrong on.

1. Christa left home at 4:00a.m. since she had to drive to Atlanta for a meeting.
since she had to drive to Atlanta for a meeting is the part that is underlined.
I feel that this sentence has a dependent clause.

2. Although he had to complete the assignment, Evan decided to eat a quick lunch.
Although he had to complete the assignment is underlined in the sentence.
I feel that this is a dependent clause.

Please let me know if I am right or wrong on these.

Yes! You're doing very well on this exercise! :-)

Thank you. There is one sentence that I am stumped on. It is as follows:

Students who fail to show up for the Regents test must enroll in the Regents' remediation courses.

The part of the above sentence that is underlined is-who fail to show up for the Regents test. That is what has me stumped.

It's not a complete sentence, so it's not an independent clause. Because it has a subject and verb, it's a clause. In this case, it's an adjective clause modifying students.

Okay. Adjective clause in this case is what you are saying. Let me ask you. If the choices though are dependent clause or independent clause or neither then it would be neither is that correct?

It's a dependent clause.

You are correct on both counts!

In sentence 1, "since she had to drive to Atlanta for a meeting" is indeed a dependent clause. It starts with the subordinating conjunction "since" and cannot stand alone as a complete sentence. It provides additional information about why Christa left home at 4:00a.m.

In sentence 2, "Although he had to complete the assignment" is also a dependent clause. It begins with the subordinating conjunction "Although" and cannot function as a complete sentence. It adds information about Evan's decision to eat a quick lunch despite having to complete the assignment.

Well done!