next please: find the 1st, 4th and 10th terms of the arithmetic sequence described by the given rule: A(n)=12+(n-1)(3)

Question

anonymous · Answer

I'm going to try and learn arithmetic sequences on my own, 7th grade doesn't have that.

anonymous · Answer

I thought you just substitute n with 1,4 and 10 to find your answer

anonymous · Answer

For 1
12+(1-1)(3)= 12 

For 4
12+ (4-1)(3) = 21

For 10 
12+ (10-1) (3) = 39

anonymous · Answer

how did you get the 1 4 and 10

anonymous · Answer

1st term 4th term and 10th term

anonymous · Answer

oh duh i am so dumb!so all i need to do is substitute it to the n's. OMG so embarrassing. thank you so much.

anonymous · Answer

No problem. =) I always forget stuff like that too haha

anonymous · Answer

thats how you do that? wow that is actually a simple thing, never done it before though.