Explanation:
Tess's expression is NOT equivalent because she forgot to include the - sign when multiplying -7 and -4.
Bernette's expression is NOT equivalent because she did 2-7 first which is not correct. Since the -7 is connected to the parenthesis, she needs to fully distribute the -7 into the parenthesis before including the 2.
Lucy's expression IS equivalent because she factored it correctly and distributed the -7 into the parenthesis.