What is the missing term of this arithmetic sequence: 23, 18, 13, 8, 3, _, -7, -12

Which of the following is the common difference in the sequence: -7, -4, - 1, 2, 5,...?

Which of the following is an arithmetic sequence?

Which of the following is NOT an arithmetic sequence?

Which of the following is not an arithmetic sequence?

Which of the following is the first positive term of the arithmetic sequence: -11, -8, -5, …?

 Which of the following is the common difference of an arithmetic sequence if $$a_2=8$$   and $$a_8=26$$  ?

Which of the following is the common difference in the arithmetic sequence: $$2$$  , $$\frac{11}{4}$$  , $$\frac{7}{2}$$  , $$\frac{17}{4}$$  ,...?

Which of the following is the common difference in the sequence: 5, 7, 9, 11, …