Question

All of the following are equivalent except 4 x y , 4 + y , 4y, (4)(y)

Answer 1

4+y is not equivalent to the rest

4y=4*y. In algebra, when a number and variable are placed next to each other, it represents multiplication. This also applies to (4)(y), which is 4*y.

Answer 2

4 x y, 4y and (4)(y) are equivalent

except

4 + y