Final answer:
No, John will not be able to enforce the contract he made with Isaac.
Step-by-step explanation:
No, John will not be able to enforce the contract he made with Isaac.
In order for a contract to be legally binding, all parties involved must have the legal capacity to enter into the contract. This includes having the necessary licenses or qualifications to provide the services promised in the contract.
Since John did not have a license to practice medicine in Florida, he did not have the legal capacity to offer medical services, and therefore the contract he made with Isaac would be considered void and unenforceable.