Nice find on the cent ! Also the cent is a bit of a Greaser , the E of EPU is mostly missing from a grease filled die in that area.
Put a picture up of that 2000-D cent's obverse. Your photo does appear to show a wide A M variety. But, there are no Denver mint cents shown for this error. The nickel is worth a nickel. The quarter is worth a quarter. Yes, almost all coinage without a mint mark is from Philadelphia. Unless.....there are coins in proof sets that ended up without mint marks and they command a slight premium. With that said your quarter is worth $0.25.