Nicholas has a collection of books. He has 115 fantasy and science fiction books. These books are 46℅ of his collection. How man
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Answer:
25150
Step-by-step explanation:
First, we have to see that this is an arithmetic sequence... since to get the next element we add 5 to it. (a geometric sequence would be a multiplication, not an addition)
So, we have a, the first term (a = 4), and we have the difference between each term (d = 5), and we want to find the SUM of the first 100 terms.
To do this without spending hours writing them down, we can use this formula:
If we plug in our values, we have:
S = 50 * (8 + 495) = 50 * 503 = 25150
The surface area of a sphere is given by 
where r represents the radius.
As the radius is given as 60 meters we replace r with 60 in the formula above to get the surface area.
As the radius is given as 60 meters we replace r with 60 in the formula above to get the surface area.