Question

What is the 100th term in the arithmetic sequence beginning with 3,19 … ? (show your work).

Answer 1

Looks like an arithmetic sequence where
a =4 and d = 5
term(n) = a + (n-1)d = 4 + (n-1)(5) = 4 + 5n - 5 = 5n -1
term(100) = 5(100) - 1