Identifying Number Sequence

What kind of sequence is illustrated below?
 400, 200, 100, 50, 25, ...

• Arithmetic

• Geometric

• Neither

Determine whether the sequence is arithmetic, geometric, or neither.

• arithmetic

• geometric

• neither

What number follows 20 in this arithmetic sequence?

8,11, 14, 17, 20

• 5

• 23

• 26

• 29

In a geometric sequence, if a1 = 3 and r = 2, what is the value of a6?

• 96

• 48

• 192

• 64

Find the 16th term of the sequence 1, 5, 9, 13, ...

• 60

• 61

• 64

• 65

An arithmetic sequence is given below.

2, 9, 16, 23, ...

Which is the explicit formula for the n^th term a_n?

(Look at the choices carefully! You may have to simplify your equation to get the correct choice!)

• a_n = -7n+9

• a_n = 7n-5

• a_n = 7n-9

• a_n = -7n+5

Which number is missing in this pattern? 
62, 68, 76, 82, 90, 96 ___, 110

• 102

• 106

• 104

• I don't know

Which of the following is NOT a geometric sequence?

• 6,18,54,162

• 14,28,42,56

• 2,18,162,1458

• 8,24,72,216

Create a rule for the sequence: -3, 6, -12, 24, ...

• f(n) = -3+ 2n

• f(n) = -3(-2)^n-1

• f(n) = (-3/2)(-3)ⁿ

• f(n) = (3/2)(-2)ⁿ

Find a₂₆ in the arithmetic sequence: -15, -35, -55, -75, ... (Hint: Write the explicit rule first, then use it to solve)

• -515

• -490

• -535

• 460