which of the expressions doe not contain any like terms?    a. 2x2+3x-4x+2     b. xy+yz-17     c. x2+x2-2x-x2   d. 4+8+y

b. does not contain any like terms, because xy, yz, and -17, do not share any common variables.  Hope this helps!

The answer is B it does not have any of the other terms