Question

The elevation of a canyons floor was -6 meters. Erosion caused the elevation to change by -5 meters over the next 100 years. What is the elevation of the floor after 100 years?

Answer 1

Answer: -11 meters

Step-by-step explanation:

Draw a vertical number line. Mark -6 on it which is 6 units below 0.

Then move down 5 units to arrive at -11

This shows us that -6 - 5 = -11

See the diagram below.