Expressions do not have an equal sign (although they can have operators such as plus or minus).
is an expression.
is an equation since it has an equal sign.
(I need help again)
2 answers:
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It belongs to the square root family. Your answer is B. Why the square root family? Because 
can be written as 
When you raise to 1/2 or 1/3 it is like saying the square root or the cube root.
When you raise to 1/2 or 1/3 it is like saying the square root or the cube root.