Arithmetic or Non Arithmetic

Given the sequence: 15, 17, 20, 24, 29, ...Is it arithmetic, geometric or neither? If arithmetic, what is the common difference? If geometric, what is the common ratio ?

• Arithmetic, common difference is 2

• Arithmetic, common difference is -2

• Not Arithmetic or Geometric, no common difference or common ratio

• Geometric, common ratio is 2

Given the sequence: 17, 14, 11, 8, 5, ...Is it arithmetic, geometric or neither? If arithmetic, what is the common difference? If geometric, what is the common ratio ?

• Arithmetic, common difference is 3

• Arithmetic, common difference is -3

• Not Arithmetic or geometric, no common difference or common ratio

• Geometric, common ratio is -3

Write an explicit rule for the arithmetic sequence:

2, 8, 14, 20...

• a_n=2+6n

• a_n=-6+6n

• a_n=6n-4

• a_n=4-6n

Find the first term, a₁, given the following information about an arithmetic sequence:

a₁₄=68

d=3

• 14

• 20

• 26

• 29

Given a₃₌ 17 and common difference is 4,

write an explicit rule that models the sequence.

• a_n = 4n + 9

• a_n = -4n - 5

• a_n = 4n + 5

• a_n = -4n + 9

Find the 25th term of the sequence if a₁ = 5 and d = 0.5

• 18
• 17
• 15
• 14

Given a₄=8 and a₇=14 in an arithmetic sequence, find the common difference, d.

• 6

• 3

• 2

• -2

What type of sequence is: 4, -8, 16, -32,..? If arithmetic, what is the common difference, d? If geometric, what is the common ratio, r?

• Geometric (r = -2)

• Arithmetic (d = 4)

• Geometric (r = 2)

• Arithmetic(d = -4)

Determine the common ratio for the geometric sequence: 100, 80, 64, 51.2

• r = 4/5

• r = 5/4

• r = -20

• r = 20