Question

The support for a bridge has its base 83 feet below the surface of a river and its highest point 214 feetabove the river's surface.If an engineer uses the numeral 214 to represent the elevation of the bridge support's highest point withrespect to the river's surface, what numeral should the engineer use to represent the elevation of thebridge support's base with respect to the river's surface?

Answer 1

The answer is -83 feet.

We can answer this question, if