SOLUTION: How do i find the 15th term of the series 3,7,11,15...

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Question 636692: How do i find the 15th term of the series 3,7,11,15...
Answer by jim_thompson5910(28595) About Me  (Show Source):
You can put this solution on YOUR website!
nth term:

an = a1 + (n-1)*d

an = 3 + (n-1)*4

an = 3 + 4n - 4

an = 4n - 1

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15th term

an = 4n - 1

a15 = 4(15) - 1

a15 = 60 - 1

a15 = 59