Arithmetic Sequences

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Question 1
Which of the following is an arithmetic sequence?

Question 2
$$3,-2,-7,\cdots$$ is an arithmetic sequence. What is the common difference of the sequence?

Question 3
$$a_1 =3$$ and $$a_2 = 7$$. Which is true?

Question 4
$$a_3 = 4$$ and $$a_5 = 14$$. What is the common difference?

Question 5
If $$a_1 = 4$$ and the common difference is 3, then what is the sum of the first twenty terms of the sequence?

Question 6
$$a_1 = -3$$ and $$a_5 = 5$$. Find $$a_{10}$$?

Question 7
If $$a_3 = 11$$ and $$a_5 = 7$$ and $$a_k$$ is the k-th term of the sequence and $$a_k = -9$$, then what is the value of k?

Question 8
If $$a_n = 2n -8$$, then which one is not a term of this sequence?

Question 9
$$-7,-4,-1,2,5, \cdots$$ is an arithmetic sequence. What is the common difference?

Question 10
$$a_n = 3n+2$$ and $$b_n= 2-3n$$ and $$c_n = a_n +b_n$$. Find $$c_4$$?

Question 11
Let a, b, c are three consecutive terms of an arithmetic sequence. Which is true?

Question 12
If $$a_1 = 10$$ and the common difference is -3, then:

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