Answer:
T(n) = 9n - 24
Explanation:
The first term is -15, therefore a = -15
The difference between the 1st and 2nd term is 9, therefore d = 9.
Set up the equation with T(n) = a + (n-1)d
T(n) = -15 + (n-1)(9) = 9n - 24
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