Question

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$an = a + (n - 1)d \\ an = - 3.1 + (25 - 1)0.1$
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Answer 1

Answer:

$arithmatic \: progression \\ a + (a + d) + (a + 2d)....+(a + (n - 1)d) \\ where \\ a = first \: term \\ d = common \: difference \\ n \: = no. \: of \: terms$

Step-by-step explanation:

$last \: term = - 3.1 + (25 - 1) \times 0.1 \\ = - 3.1 + 2.4 \\ = - 0.7$