Question 19: Suppose in addition to mailing the letter on November 10th (never received by Bob), on November November 14th, Sam telephoned Bob to confirm his acceptance of Bob's offer. Was there a contract between the two men as a result of either the letter or the telephone call?Question 20: Suppose that during the telephone conversation on November 14th, Bob said he was revoking his offer to buy the hot rod. Was the revocation effective? [Short essay answer]