The Nth term of tn = 2n + 3 is 2N + 3.
Replace (substitute) the n by the term number to get its value.
t1 = 2 x 1 + 3 = 5
t2 = 2 x 2 + 3 = 7
t3 = 2 x 3 + 3 = 9
etc.
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The nth term is: 5-2n
Nth term With the nth term you substitute the n for the term number (e.g. 50) so the 50th term in 2n+3 would be 2x50+3=103
2n+3. If 5 is the first term, then it is 2n + 3 (2×1 = 2 + 3 = 5 and 2×2 + 3 = 7)
Un = (-1)n*(2n - 1)
(2n-1)(-1)n