during the civil war, the standard heavy gun for coastal artillery was the 15in rodman cannon, which fired a 330 pound shell. if one of these guns is fired from the top of a 50 foot high shoreline embankment, then the height of the shell above the water (in feet) can be approximated by the function p(x) = -0.0000167x^2 + 0.23x + 50, where x is the horizontal distance (in feet) from the foot of the embankment to a point directly under the shell. how high does the shell go, and how far away does it hit the water?