Question

What is the 89th term of term of the aritmetic sequence -1 3 7 11

Answer 1

351

Explanation:

we notice that the sequence follows a simple +4.

Thus we can devekop a simple relation

f(n) = 4x - 5

The -5 is simply so the sequence starts at -1

f(89) = 4(89) - 5

= 351