Question

Find a9 of an= 3n-7.​

Answer 1

a9 = 20

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Answer 2

a9=20

Explanation:

an=3n-7

a1=3(1)-7

=3-7

=-4

a2=3(2)-7

=6-7

=-1

a3=3(3)-7

=9-7

=2

a=-4....a2=-1....a3=2

d=a2-a1

=3

a9=a+(n-1)d

=-4+(9-1)3

=-4+8(3)

=-4+24

=20..