need help with these!

A void contract is unenforceable. True False QUESTION 6 Promissory estoppel a. prevents a party from being unjustly enriched by a defective contract b. is an equitable remedy c. is binding if injustice can be avoided only by enforcement of the promise d. all of the above A promise for an action is a a. bilateral contract b. unilateral contract c. multiparty contract d. none of the above QUESTION 8 An offer must be a. communicated b. definite c. reasonable d. both a \& b