a=18.9,d=2.5,n=?,an=3.6
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a n = 3.6
a + (n - 1) d = 3.6
-18.9 + (n - 1) (2.5) = 3.6
(n -1) 2.5 = 3.6 + 18.9
(n - 1) 2.5 = 22.5
n - 1 = 22.5/2.5
n - 1 = 9
n = 9 + 1
n = 10
a + (n - 1) d = 3.6
-18.9 + (n - 1) (2.5) = 3.6
(n -1) 2.5 = 3.6 + 18.9
(n - 1) 2.5 = 22.5
n - 1 = 22.5/2.5
n - 1 = 9
n = 9 + 1
n = 10
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