SOLUTION: I need to find a formula for the nth term from the following arithmetic sequence. Then find the fiftieth term: 3,7,11,15,... Thank you for attempting to help me solve this problem.

Algebra ->  Sequences-and-series -> SOLUTION: I need to find a formula for the nth term from the following arithmetic sequence. Then find the fiftieth term: 3,7,11,15,... Thank you for attempting to help me solve this problem.      Log On


   



Question 33641: I need to find a formula for the nth term from the following arithmetic sequence. Then find the fiftieth term: 3,7,11,15,... Thank you for attempting to help me solve this problem.
This problem is from a made up worksheet.

Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
use the formula:
a(sub n)=a(sub 1) + (n - 1)d
where n is the arithmetic term;
where a(sub 1) is the first term;
where d is the difference;
in this sequence: 3,7,11,15,... the difference is obviously 4
a(sub n)= a(sub 1) + (n - 1)d original equation
a(sub n)= 3 + (n - 1)(4)
a(sub 50) = 3 + (50-1)(4)
a(sub 50) = 3 + 196
a(sub 50) = 199