Use the terms 4, 12a, 6, 2a, and 24 to make equivalent
expressions. use each term only once. use substitution
to prove that the expressions are equivalent.
show your work.

Explanation:

Those expresisions are equivalent because for any value that you use to substitute the variable   both expression will return the same value.

Here is an example of substitution proving that the expresssions are equivalent:

hdjd

step-by-step explanation:

not sure but it may be b, as i said i'm not sure.