Idon't think i can finish is this phrase dependent or independent clause

I believe that "I don't think I can finish." is an independent clause.  An independent clause is a sentence. Jim studied in the Sweet Shop for his chemistry quiz. Dependent Clause. A dependent clause is a group of words that contains a subject and verb but does not express a complete thought. A dependent clause cannot be a sentence. "I don't think I can finish," is a complete sentence. It has a verb, finish, and a subject, I.

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Rational solutions. often the  solutions  to quadratic equations are  rational  numbers, which are integers or fractions. the requirement for the  solution  to be an integer or fraction is that √(b2  − 4ac) is a whole number.