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2

laylay12014.02.2022 06:30an = a+(n-1) d

this is the rule

baches14.02.2022 06:30nth term = 21 - 3n

Step-by-step explanation:

18,15,12,9

This is an arithmetic sequence.

a= first term = 18

Common difference = d = second term - first term

d = 15 - 18

d = -3

nth term = a + (n-1)d

= 18 + (n-1)*(-3)

= 18 + n*(-3) - 1*(-3)

= 18 - 3n + 3

= 21 - 3n