Answer:
-37.5 m
Step-by-step explanation:
If we assume that "one full day" is 24 hours, then 15 hours represents the fraction 15/24 of a day. Since the drilling rate was constant, and was presumed to start from a height of 0, the height after 15 hours is that fraction of the day's work:
... (15/24)×(-60 m) = -37.5 m
∈ means '(is) an element of'
For instance, 'Let a ∈ A' means 'Let a be an element of A'
http://en.wikipedia.org/wiki/Element_(mathematics) might help you too
Answer:
36/39
Step-by-step explanation:
Cos(theta) = Base/Hypotenuse
Cos(X) = 36/39
1/4 is least, next is 1/2 and the greatest is 5/8