Question

Which expression does not belong with the other three?

O a?+ 4a
ox? – 8x
b-2-1
7 + 6yz

Answer 1

It's a little hard to tell from the gibberish in the choices but let's go with

Answer: 7 + 6yz

which is of second degree in its variables and has two variables. That's two differences than the first three, which are first degree univariate.