When the drill reaches a depth of -915 feet or lower, scientists have to add a special liquid to prevent 5
the hole from freezing over. If the research team drills – 50 feet per day, how many days will it take
6
to reach a depth of -915 feet?
V
What is a reasonable estimate for the number of days?
200 days
50 days
20 days
5 days
_915 -1,000 -50% -50
-1,000 = (-50) = ?