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Question
The table shows the elevation of a dolphin relative to sea level at the end of each minute as it swims, sometimes jumping out of the water. Distances above sea level are positive values, and distances below sea level are negative values.
Time Elevation
Minute 1 5 feet above
Minute 2 7 feet below
Minute 3 4 feet above
Minute 4 7 feet below
Minute 5 4 feet below
Which two lines in the table combine to create an elevation of 0?
The two lines that combine to create an elevation of 0 are:
- Minute 2: 7 feet below sea level
- Minute 3: 4 feet above sea level
Adding the negative value of 7 feet below to the positive value of 4 feet above will result in an elevation of 0.
To find the two lines in the table that combine to create an elevation of 0, we need to look for two consecutive lines where the elevation changes from a positive value to a negative value, or from a negative value to a positive value.
Looking at the table, we can see that the elevation goes from 5 feet above sea level in Minute 1 to 7 feet below sea level in Minute 2, which corresponds to a change of 12 feet.
Similarly, we can see that the elevation goes from 4 feet above sea level in Minute 3 to 7 feet below sea level in Minute 4, which corresponds to a change of 11 feet.
Therefore, the two lines that combine to create an elevation of 0 are Minute 3 (4 feet above) and Minute 4 (7 feet below).