Unit 6 Test Review

An arithmetic sequence is a sequence with a common _________.

• difference
• ratio
• absolute value
• domain

A geometric sequence is a sequence with a common _________.

• difference

• ratio

• formula

• absolute value

What formula would you use to find a term for

6, 24, 42, 60, ...?

What formula would you use to find a term for

6, 18, 54, 162, ...?

What is the common ratio?

• -2

• 2

• 4

• Not enough information

What is the common ratio?

• 5

• -5

• 3

• Not enough information

Find the common ratio for the geometric sequence.

• 2
• -2
• 1/2
• -1/2

Write the explicit formula for the geometric sequence.

Find a1 and r and plug in.

• a_n = 10(2)^n-1
• a_n = 2(10)^n-1
• a_n = 10(2)ⁿ
• a_n = 2(10)ⁿ

Which sequence is an arithmetic sequence?

• 3, 6, 2, 7, ...

• 3, 6, 12, 24, ...

• 3, 6, 10, 15, ...

• 3, 7, 11, 15, ...

The first term of an arithmetic sequence is b and the second term is c. What is the explicit formula to find the n^th term of

the sequence?

• a_n = b + (n − 1) c

• a_n = c + (n − 1) b

• a_n = b + (n − 1) (b − c)

• a_n = b + (n − 1) (c − b)