Test: Arithmetic Series I - Ambitious

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Question 1:   Find the formula of the n-th term of an arithmetic progression b n : a+3, a+1, a1, a3,
b n =a2n+5 
b n =a+2n+1
b n =a2n+4
b n =a2n+1
Question 2:   In the arithmetic progression ( a n ): a 1 =1;d=2.5 . Is 13.5 a term of this progression? If yes, find its number.
n=13
n=6
13.5 is not a term of this progression
n=5
Question 3:   Find the initial term of the arithmetic sequence ( a n ), if b 5 =11;  b 11 =7 .
a 1 =26
a 1 =19
More data is needed
a 1 =23
Question 4:   What is the number of the first positive term of an arithmetic sequence ( a n ): 10.2;9.5;8.8; ?
n=10
n=14
n=16
n=15
Question 5:   Find the first negative term of an arithmetic sequence ( a n ): 7.2;6.6;6 .
0.1
0.6
1.8
1.2
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