Debbie is borrowing 3 books from her friend who has a collection of 45 books. Which of the following expressions represents the
2 answers:
Answer: b.C(45, 3)
Step-by-step explanation:
Given: Debbie is borrowing 3 books from her friend who has a collection of 45 books.
Therefore, the number of ways Debbie can choose a group of 3 books will be equal to the number of combinations of selecting 3 books from 45 books.
i.e. The number of ways Debbie can choose a group of 3 books=
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Area of circle = 
Answer:
The value of x at this instant is 3.
Step-by-step explanation:
Let , we get an additional equation by implicit differentiation:
(1)
From the first equation we find that:
(2)
By applying (2) in (1), we get the resulting expression:
(3)
If we know that and
, then the first derivative of x in time is:
From (1) we determine the value of x at this instant:
The value of x at this instant is 3.