The question requires you to select the expressions that are equivalent
Starting with the first one
1. 3z + 2z and 5z ---------the expressions are equivalent because
3z + 2z = 5z
2. {8x - 8x} - y and 0
8x -8x = 0
0-y = -y
So the expressions are not equivalent
C. 9.1 + 4.5a -2.5 a and 11.1a
Adding like terms : 4.5 a - 2.5 a = 2.0 a
9.1 - 2.0 a is not equivalent to 11.1 a
D. -7y(3) – 3 and 0
-21y -3 is not equivalent to 0
E.
y-6{3} and y-18
y-18 and y-18 ------equivalent expressions
Answers
A and E