Melanie’s bank account balance is $97 − . She needs to pay $55 to her cell phone carrier and $80 to the landscaper. She also expects $250 from her sister to be added to her account.

(a) Write an expression Melanie can use to determine her bank account balance after paying these bills and receiving money from her sister.

(b) What is Melanie’s bank account balance after paying her bills and receiving money? Show any necessary work. Answer in a complete sentence.