Ericka decided to compare her observation to the average annual trend, which shows the water rising 1.8 mm/year. Remember, she u
sed 6.2 years as her time period Explain how she would calculate the difference between how much water levels rose on average and how much the water level fell in the part of the river she observed.
She would multiply the rate by the years to find the average rise in water levels, or 1.8 times 6.2 = 11.16. To find the difference between the water levels, she would subtract -13.64 from 11.16.
