In the following situations indicate whether acceptance has occurred. Explain why or why not.

1. Mary said to John, "If you run the Rock 'n' Roll USA Half Marathon in 90 minutes or less, I will pay you $200." John responded, "I'm pretty sure that I can do it, and I will begin training tomorrow."

1. Julio said to Sally, "If you will shoe my horse tomorrow, I will pay you $50." Sally says, "I accept."