Answer :
Final answer:
Mary used 578 pounds of turkey to make the sandwiches, which is determined by subtracting the amount of turkey left (434 pounds) from the amount she originally had (1012 pounds).
Explanation:
To determine which statement about the amount of turkey Mary used is true, we need to subtract the amount of turkey left after making the sandwiches from the initial amount she bought.
Mary started with 1012 pounds of turkey and has 434 pounds left.
By subtracting the amount left from the initial amount (1012 - 434), we find that Mary used 578 pounds of turkey.
Since the question specifies that the turkey was used for making sandwiches, the true statement is that Mary used 578 pounds of turkey for the sandwiches.