Find the sum of the arithmetic series given a1=8,a14=99,n=14.
1 answer:
Answer:
The sum of the series is: 749
Step-by-step explanation:
Given



Required
The sum of the series
This is calculated using:
![S_n = \frac{n}{2}[a_1 + a_n]](https://tex.z-dn.net/?f=S_n%20%3D%20%5Cfrac%7Bn%7D%7B2%7D%5Ba_1%20%2B%20a_n%5D)
Substitute 14 for n
![S_{14} = \frac{14}{2}[a_1 + a_{14}]](https://tex.z-dn.net/?f=S_%7B14%7D%20%3D%20%5Cfrac%7B14%7D%7B2%7D%5Ba_1%20%2B%20a_%7B14%7D%5D)
![S_{14} = 7[a_1 + a_{14}]](https://tex.z-dn.net/?f=S_%7B14%7D%20%3D%207%5Ba_1%20%2B%20a_%7B14%7D%5D)
Substitute values for a1 and a14
![S_{14} = 7[8 + 99]](https://tex.z-dn.net/?f=S_%7B14%7D%20%3D%207%5B8%20%2B%2099%5D)


You might be interested in
Answer:
Step-by-step explanation:
1/4
Answer:
504
Step-by-step explanation:
Answer:
21
Step-by-step explanation:
- 7 for first 10 shots
- 7 for another 10 shots
- 7 for last 10 shots
A = 84.825 because the area of a circle is 113.1 and 1/4 of it is missing.
X= 115x95 this is because when you solve it will give you your answer