Three United States Navy have been named USS America, after America, the large landmass of the Western Hemisphere.
The first America was a 74-gun ship of the line laid down in 1777, but not launched until 1782, at which time she was given to France and used there for a few years before being broken up.
... 2a is zero and it is impossible to divide by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of thos ...