Answer:
The first term is:
Step-by-step explanation:
The arithmetic sequence is defined by
![a_n=a_1+\left(n-1\right)d](https://tex.z-dn.net/?f=a_n%3Da_1%2B%5Cleft%28n-1%5Cright%29d)
where
is the first term
is the common difference
as
the 17th term of an arithmetic sequence is 51.
i.e. ![a_{17}=51](https://tex.z-dn.net/?f=a_%7B17%7D%3D51)
so
![a_n=a_1+\left(n-1\right)d](https://tex.z-dn.net/?f=a_n%3Da_1%2B%5Cleft%28n-1%5Cright%29d)
∵
,
, ![d=7](https://tex.z-dn.net/?f=d%3D7)
∵ ![\left(17-1\right)\cdot \:\:7=112](https://tex.z-dn.net/?f=%5Cleft%2817-1%5Cright%29%5Ccdot%20%5C%3A%5C%3A7%3D112)
![a_1=-61](https://tex.z-dn.net/?f=a_1%3D-61)
Therefore, the first term is:
The answer to your question is 424
The correct answer is A (always).
The radius of a circle is half way in the center.
The diameter of a circle is all the way in the center.
( there is a picture to give you a visual understanding ) :)
If you have any questions be free to ask!!!!!! :)