The first question is saying that one day, a item was 12 dollars! Then, they lowered the prince by 1 dollar. And then again another dollar. And then they added 3 dollars to the price.
The expression would be 12 - 2 + 3!
Evaluating the expression (what’s the answer-solve the expression) would be 13 dollars. So the answer is 13 dollars.
Then what does your answer to part B mean in the context of the problem, (what does 13 mean) it would be 13 means how much money the price is right now! HOPE THIS HELPS! :) ANY QUESTIONS ASK MEEE