Answer:
9xy = 3x . 3y
2xyz = 2x . y . z
4x . 4y = 16xy
1, 4, 5.
Step-by-step explanation:
1. 3x * 3y is equal to 9y.
4. 2x * y * z is equal to 2xyz, since the grouped variables mean the same thing as multiplied.
5. 4x * 4y is 16xy, because 4 * 4 is 16 and x * y is xy.
