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35th term is -81

8th term is 0

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nth term is -55

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1st question

It will be the 35th term of the AP

0 can be a term of AP because it's decreasing.

3rd question

A.

B. a is given as - 13 but a should be 22

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If each term of an AP is doubled then the common difference also doubles.

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1.) n= 35 6.) as the terms gets doubled the common terms gets doubled too

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35

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1st AP

The formula is wrong because the given formula is applicable only for an+1

2nd AP

The first term and common difference have interchanged their position

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an=3-6n

an=5n+2

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Doubling each term means multiplying with two hence arithmetic progression depending on upon common d but in this case the common difference varies within each term as

A1*1,a2*2