Question

The first 19 terms of the arithmetic sequence 9, 2, -5, -12,...

Answer 1

9, 2, -5, -12,...

First let's find the common difference

Common difference= 2 - 9 = -7

So we will add - 7 to get the next term

9, 2, -5, -12, -19, -26, -33,-40, -47, -54, -61, -68, -75, -82, -89, -96, -103, -110, -117