Find the 68th term of the arithmetic sequence -19, -33, -47, ...

Answer 1

https://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html

Answer 2

https://en.wikipedia.org/wiki/Arithmetic_progression
NOTE: x = (n-1)*d.
x is the final answer.
n = number of terms, n this case n = 68
d = difference between terms.

Answer 3

oops. I made a typo and left out a term in my example. The url I gave gives the correct formula.