If you are concerned about a refund, and the statute of limitations for filing a claim for refund for the year(s) at issue has not yet expired, you should file Form 1040X, Amended U.S. Individual Income Tax Return, to protect your statute of limitations. File a separate Form 1040X for each year.
The opossum's dental formula is: 5.1.3.4 4.1.3.4 In many mammals the children have a set of teeth that fall out and are replaced by adult teeth. These are called deciduous teeth, baby teeth or milk teeth. Animals that have two sets of teeth, one followed by the other, are said to be diphyodont.
Phosphate has a charge of 3-, so we will have 3 magnesium cations. We end up with our final formula: Mg3(PO4)2. Ions are not in parentheses unless they are polyatomic, and there is more than one of the polyatomic ions. This is why the NO3 in NaNO3 is not in parentheses, and in parentheses in Mg(NO3)2.