Sequences Check In

What type of sequence is: 11, 8, 5, 2, -1,....

• arithmetic

• geometric

• neither

• mathometric

What type of sequence is: 4, -8, 16, -32,..?

• Geometric (r = -2)

• Arithmetic (d = 4)

• Geometric (r = 2)

• Arithmetic(d = -4)

Solve for the difference in the arithmetic sequence: -50, -75, -100, -125,....

• d = 25

• d = -25

• d = 1.5

• d = -1.5

Solve for the ratio in the geometric sequence: 100, 80, 64, 51.2

• r = 0.8

• r = 1.25

• r = -20

• r = 20

Write a formula for the arithmetic sequence using n-1 and f(n) or a(n)

Which is a formula for the arithmetic sequence: 5, -3, -11, -19, -27,....

• f(n) = -8(n-1) + 5

• f(n) = 5(n-1) - 8

• a(n) = 5 + 8(n-1)

• a(n) = 8 + 5(n-1)

How does the recursive formula work?

• It uses the previous terms to find only the next term

• It uses two terms to find any term

• it uses the previous terms to find any term

• it is written in really cool writing style

What would the geometric recursive formula look like for a pattern with first term = 5 and r = 1.2?

• f(n) = f(n-1)(1.2); f(1) = 5

• f(n) = f(n-1)(5); f(1) = 1.2

• f(n) = 5(1.2); f(1) = 5

• f(n) = 1.2f(n-1) + 5; f(1) = 5

With the recursive formula, find the next term:

f(1) = 55

, f(n) = 2f(n-1) - 10

• f(2) = 100

• f(2) = -8

• f(2) = 90

• Not enough information

Find the common ratio: 4, -16, 64, -256, ...

• r = -4

• r = 2

• r = -2

• r = 4