Arithmetic Sequences

Which of the following is an arithmetic sequence?

[tex]3,-2,-7,\cdots[/tex] is an arithmetic sequence. What is the common difference of the sequence?

[tex]a_1 =3 [/tex] and [tex] a_2 = 7 [/tex]. Which is true?

[tex] a_3 = 4 [/tex] and [tex] a_5 = 14 [/tex]. What is the common difference?

If [tex] a_1 = 4 [/tex] and the common difference is 3, then what is the sum of the first twenty terms of the sequence?

[tex] a_1 = -3 [/tex] and [tex] a_5 = 5 [/tex]. Find [tex] a_{10} [/tex]?

If [tex] a_3 = 11 [/tex] and [tex] a_5 = 7 [/tex] and [tex] a_k[/tex] is the k-th term of the sequence and [tex] a_k = -9 [/tex], then what is the value of k?

If [tex] a_n = 2n -8 [/tex], then which one is not a term of this sequence?

[tex] -7,-4,-1,2,5, \cdots [/tex] is an arithmetic sequence. What is the common difference?

[tex] a_n = 3n+2 [/tex] and [tex] b_n= 2-3n [/tex] and [tex] c_n = a_n +b_n [/tex]. Find [tex] c_4 [/tex]?

Let a, b, c are three consecutive terms of an arithmetic sequence. Which is true?

If [tex] a_1 = 10 [/tex] and the common difference is -3, then: