Statistics: Sequence

1.

88, -44, 22, -11 ...

The first four terms in a sequence are shown above. Each term after the first is found by multiplying each term by $\dfrac{-1}{2}$. What is the 7th term in the sequence?

(A)$5\dfrac{1}{2}$

(B)$2\dfrac{3}{4}$

(C)$1\dfrac{3}{8}$

(D)$\dfrac{-11}{16}$

(E)$-2\dfrac{3}{4}$

2.

1, 1, 2, 3, 5...

The first five terms are shown above. Each term after the first is found by adding the previous term to the current one. Using the sequence above, what the 8th term in the sequence?

(A)17

(B)13

(C)34

(D)21

(E)55

3.

6, -6, -18, -30, -42 ...

The first five terms in a sequence are shown above. Each term after the first is found by adding -12 to the term immediately preceding it. Which term in this sequence is equal to $6 + (9-1)•-12$?

(A)The 8th

(B)The 9th

(C)The 10th

(D)The 11th

(E)The 12th

4. 

60, 12, 2.4, ...

In the sequence above, each term after the first term is 20% of the term preceding it, What is the fifth term in this sequence?