![find \: \: an = a + (n - 1) \: (d) \\ \\ 3.6 = - 18.9 + (n - 1)(2.5) find \: \: an = a + (n - 1) \: (d) \\ \\ 3.6 = - 18.9 + (n - 1)(2.5)](https://tex.z-dn.net/?f=find+%5C%3A++%5C%3A+an+%3D+a+%2B+%28n+-+1%29+%5C%3A+%28d%29+%5C%5C++%5C%5C+3.6+%3D++-+18.9+%2B+%28n+-+1%29%282.5%29)
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send the photo of the question
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because I am unable to understand
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