answer asap please

answer all

17. A offers to sell B his car for $500.00. B immediately sends a letter by U.S. mail accepting A's offer and encloses a $500.00 check. The letter is properly addressed and has the proper amount of postage on it. Is B's acceptance valid? A. The acceptance by B is not valid because he should have used a much faster method of communicating the acceptance. B. The acceptance is valid and effective under the "mailbox rule" when B dropped the letter into the U.S. mail system C. The acceptance is not valid as B did not follow the specific instructions in the offer by A as to how the acceptance should be communicated back to A. D. The acceptance is not valid because in today's technologically advanced age no one uses the U.S. mail system to communicate an acceptance. 18. Specific performance may be ordered by the court when: A. The contract is voidable. B. Damages are an adequate remedy. C. Damages are not an adequate remedy. D. The contract is uncertain. 19. The legal significance of the contract rule that consideration be legally valid is: A. That the consideration must be adequate and sufficient to the promises made/exchanged between the parties. B. That the consideration need not be adequate or sufficient to the promise made. C. That the consideration must be of reasonable value. D. That the consideration must be of more value than the value of promise made. 10