Question

4. San Antonio, Texas, depends on the Edwards Aquifer for its water supply. The graph shows the

decline of the water level of the aquifer over a two-week period beginning on May 20, 2012.
Aquifer Level (ft)
664
663
662
661
660
659
658
657
656
655
654
653
652
0
7
Water Level of
Edwards Aquifer
A -1.6
B. -0.8
C. 0.625
D. 1.25
8 10 12 14
Days since May 20th
Based on the graph, which of the following is the best estimate of the change in the water level.
in feet per day, during this time period?

Answer 1

d=9

Explanation:

9x1

Answer 2

The negative sign indicates that the water level is declining. So, the answer is B.

The graph shows a decline in the water level of the Edwards Aquifer over a two-week period beginning on May 20, 2012. The water level starts at 664 feet and declines to 652 feet by the end of the two weeks. This is a change of 12 feet over 14 days.

To calculate the rate of change in feet per day, we can divide the total change in water level by the number of days:

Rate of change = (Change in water level) / (Number of days)

Rate of change = (12 feet) / (14 days)

Rate of change ≈ -0.86 feet per day

Therefore, the best estimate of the rate of change in the water level is B. -0.8 feet per day.