The most widely used is cofounder. British usage generally favours the hyphen. There's no need to capitalize it since it is not a proper noun unless it is at the beginning of a sentence or being used in a title. Once it is hyphenated it becomes a single word and so“F” should not...
En dash functions in word processing programs You can always use an Insert>Symbol function to insert a proper en dash into your writing. However, the pros use these shortcuts: In MS Word: Option/Ctrl+ Minus Key (with Num Lock enabled) In Pages: Option/Alt + Hyphen or Minus Key (with...