Question

A rock is thrown into a lake from a bridge 133 feet above the lake's surface. The rock sinks 78 feet below the lake's surface. What is the difference between the elevations?

Answer 1

The elevation at which the rock is thrown is 133 feet above the lake's surface, and the elevation at which the rock sinks is 78 feet below the lake's surface.

To find the difference between the elevations, we need to add the depth at which the rock sinks to the height at which it is thrown.

133 feet (thrown) + 78 feet (sunk) = 211 feet.

Therefore, the difference between the elevations is 211 feet.