Sequences and Series Arithmetic and Geometric

Find the first four terms of the sequence given the rule:
a_n = 4(5)^n-1

• 20, 100, 500, 2500

• 5, 20, 80, 320

• 4, 20, 100, 500

• 4, 9, 14, 19

What is the fifth term of the geometric sequence?

• 135

• 1875

• 1215

• 405

−4, −12, −36, −108, ...

Find the ratio

• r=−2

• r=3

• r=−3

• r=2

Find the first four terms of the sequence given the rule: U_n = 4(5)^n-1

• 20, 100, 500, 2500

• 5, 20, 80, 320

• 4, 20, 100, 500

• 4, 9, 14, 19

What is the difference between an arithmetic sequence and a geometric sequence?

• One is the sum of the numbers and one is just a list of numbers.

• One has a common difference and one has a common ratio.

• One you can write an nth term and one you cannot.

• None of these are correct.

What is the common difference of the arithmetic sequence below?
-6, -1, 4, 9...

• 5

• -5

• -6

• 1/5

Is this sequence Arithmetic, Geometric, or Neither?
{14, 22, 30, 38, .. }

• Arithmetic

• Geometric

• Neither

What is the common ratio for the sequence:
28, 14, 7, 3.5...

• 2

• 1/2

• -14

• -7

What is the common difference:
-2, -11, -20, -29...

• Every Number

• 9

• -9

• -2

Find the missing number in the pattern. 6, 14, ____, 30, 38,...

• 18

• 20

• 24

• 22