what is an equal expression

A mathematical symbol, or combination of symbols, representing a value, or relation. Example:  2+2=4

Step-by-step explanation:

if two things are equivalent they are the same equivalent expressions are expressions that are the same even though they may look a little different if you plug in the same variable value into equivalent expressions they will each give you the same value when you simplify

step-by-step explanation:

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong