Ok, there are two parts to the question!

calculate the nth term
6,11,16,21,

using the nth term, calculate the 100th term in the sequence.

Ok sp the nth term is 5n+1 this is because from 6 to 11 you add 5 and from 11 to 16 ypu add 5 so that would be 5n after that you know the first one is 6 so 5n=5 for the first number so you just add one therefore 5n+1 the 100th term would be 100*5 +1 so that would be 501