SOLUTION: sequence of 18, 27/2, 9, 9/2, 30th term?

SOLUTION: sequence of 18, 27/2, 9, 9/2, 30th term?

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Question 869435: sequence of 18, 27/2, 9, 9/2, 30th term?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
36/2,27/2, 18/2 9/2
18,13.5,9,4.5
9*4/2, 9*3/2 9*2/2,9*1/2
d=-4.5
18,13.5,9,4.5, 0,-4.5
an = a + (n - 1)d
a2=18-4.5=27/2=13.5
a3=18-9=9
a4=18-13.5=4.5
a30 = 18 -4.5 (29)=18-130.5=-112.5

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