When Glocker received her bill from Lawnmark, a lawn- care company, she became very angry about the amount that the company claimed she owed. She immediately wrote a letter to the company’s general manager, giving her version of the amount owed and including a check for that amount. She marked on the face of the check “ paid in full settlement of the claim by the Lawnmark Company.” The general manager cashed the check and immediately sued Glocker to recover the remaining balance. Can the general manager legally collect?