Question

Write the following sequence in an form:
4,9,14,19

Answer 1

Youll see that the first term is 4, and then it keeps on advancing by 5. Infact, notice that the 2nd term is 4+1x5, the 3rd is 4+2x5 and so on... looking at the pattern we can can write:
t(n) = 4+ (n-1)5

Answer 2

can you simplify that to -1+5n?

Answer 3

yeah..open that bracket
4+ 5n -5
= 5n -1