Sequences Practice

The sequence 3, 12, 48, 144,... is _____________________

• Arithmetic

• Geometric

• Both

• Neither

What is the common ratio of this sequence?

{2, 10, 50, 250, ... }

• 1,250

• 5

• 10

• 50

• 2

Write the formula for the geometric sequence.

• a_n = 10(2)^n-1

• a_n = 2(10)^n-1

• a_n = 10(2)ⁿ

• a_n = 2(10)ⁿ

Write the formula for the geometric sequence.

• a_n = 4(3)^n-1

• a_n = 3(4)^n-1

• a_n = -4(3)^n-1

• a_n = 3(-4)^n-1

Given 
a_n = 3(2)^(n-1),      
what is the 14th term?

• 14
• 24,576
• 49,152
• 3,188,646

What is the explicit rule for the sequence: 11, 22, 44, 88

• a_n = 2(11)^n-1
• a_n = 11x2
• a_n = 11(2)^n-1

Find a₉ in the sequence 4, 8, 16, 32, ... 

• 384
• 512
• 768
• 1,024

Determine whether the sequence is arithmetic, geometric, or neither: 
2, 8, 32, 128, ...

• arithmetic
• geometric
• neither

Determine if the sequence

0.2, 1, 5, 25, . . .

is arithmetic or geometric.

Then identify the next term in the sequence.

• arithmetic; 75

• arithmetic; 125

• geometric; 75

• geometric; 125

What is the first term in the arithmetic sequence __ , 9 , __ , 33 , 45

• -1
• 3
• -3
• 6