Question

Find a formula for the nth term

of the arithmetic sequence.
First term 9
Common difference -2

Answer 1

Answer:
given,a= 9 and d= -2
nth term=a+(n-1)d
=9+(n-1)-2
=9-2n+2
=11-2n

Therefore nth term = 11-2n

Answer 2

arithmetic sequence formula: first term + (n - 1)common difference

9 + (n - 1)-2

9 + -2n + 2

= -2n + 11