Just out of curiousity.. how much do you think these coins are worth..?

Your 1964 Kennedy half dollar is .900 silver depending on it's condition it's worth appox. $11.00 to $13.00, the gold colored quarter 1976 bicentennial has been plated as for a novelty item (It is a US mint coin but someone had it or ordered it plated) is just worth .25 cents