Identify the oxidation number of carbon in each of the following: dimethyl ether (CH\({}{3}\)OCH\({}{3}\)), methylamine (CH\({}{3}\)NH\({}{2}\)), and formaldehyde [fore-MAL-duh-hyd] (H\({}{2}\)CO).
DIMETHYL ETHER: -2; METHYLAMINE: -2; FORMALDEHYDE: 0