Elaine grows and sells Walnuts. Inland Empire Nut Co $.$ ?agreed to buy all of Elaine $$ s crop under a contract that left the price unliquidated. Elaine delivered the nuts, but a dispute arose over the price. Inland Empire Nut Co $.$ ?sent a check to Elaine with a letter stating that the check was the $$ Final Settlement. $$ ?Elaine cashed the check but filed suit for breach of contract claiming she was owed more. What law applies?