Final answer:
The probe's elevation relative to sea level after the first minute is -11 feet.
Step-by-step explanation:
The probe's elevation relative to sea level after the first minute can be calculated by finding the rate of change per minute. As the probe dropped at a constant rate for 3.25 minutes and reached an elevation of -35.75 feet, we can use the formula:
Elevation after 1 minute = (Change in elevation / Total minutes) x Number of minutes
Using the given data:
Elevation after 1 minute = (-35.75 feet / 3.25 minutes) x 1 minute = -11 feet
Therefore, the probe's elevation relative to sea level after the first minute is -11 feet.