Manuel is also in Mr. Whittaker's science class. He observed that the water level rose 1.8 millimeters per year, which matches the average annual trend. This occurred for 2.2 years. Explain how to determine the tota variation in water level. How can you check your answer? 2-3 sentences

To determine the total variation in water level, you multiply the rate of change (1.8 millimeters) by the duration of observation (2.2 years). In this case, the total variation in water level is 3.96 millimeters. To check the answer, you can multiply the rate of change by the duration of observation and see if it matches the calculated total variation.