A negative elevation usually refers to the distance below sea level of a point on dry land. For example the lowest dry land on earth is the shore of the Dead Sea in Israel at -418m; that is it has a negative elevation of 418m.
Guns and canons also use elevation. Obviously if you are firing from above on a target below you will use negative elevation.
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Negative. Negative. Negative. Negative.
A negative plus a negative equals a negative.
A negative+ a negative= to a negative number.
negative*negative=positive ex. negative 2*negative 2= positive 4
A negative divided by a negative is a positive.