There are four (4) claims that may make a contract unenforceable, based on Fraud; Mistake; Duress; or Undue Influence. For each of the following, explain whether the contract would be enforceable, including whether it's void or voidable:

Your elderly neighbor who knows nothing about cars sells you her 1965 Mustang that's been sitting in her garage since her husband died 20 years ago. The only thing she knew about the car was that it was red. You later find out that the original engine has been replaced with a 4 cylinder, and that your dream muscle car is really a granny car. Did your neighbor defraud you? Misrepresent the sale? Was it a mistake? What's the remedy?

Same facts as above, except you asked about the engine in advance, and your neighbor said she checked and her mechanic told her it was the original engine. Did your neighbor defraud you? Misrepresent the sale? Was it a mistake? What's the remedy?

Same facts as above, except your neighbor allowed you to take the car to a mechanic to find out what kind of engine it had. The mechanic told you and your neighbor that it was the original engine. You later find out that the mechanic was wrong, and it's a replacement engine. Did your neighbor defraud you? Misrepresent the sale? Was it a mistake? What's the remedy?

Same facts as above, except the engine was exactly what you expected. But sadly, two days later the engine blew up. Did your neighbor defraud you? Misrepresent the sale? Was it a mistake? What's the remedy?