Which choice best describes the following sentence? Cassidy volunteered.

It is a complete and correct sentence.
It is a fragment that is missing a subject.
It is a fragment that is missing a predicate.
It is a fragment with a subject and verb but expresses an incomplete thought.

The choice that best describes the given sentence above is, it is a complete and correct sentence. What makes this sentence complete is having both the subject and the verb in a simple form, and still expresses a complete thought. The verb and simple predicate "volunteered" is enough to describe the subject "Cassidy".

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.