Lisa Lowe takes her car to the Browning Garage and agrees to pay $75 for a tuneup. Before the job is completed, Lowe tells the owner, Ill pay you $10 extra if you do a good job. Is Lowe bound to her promise? Explain your answer.

Carmen Sanchezs debt to Bernie Martin is due on June 1. On May 20, Martin signs a written promise to give Sanchez an addi-tional two months to pay the debt. Is this promise binding? Why or why not?