Quiz about Geometric Function

Question 1

Is the sequence-4, -12, -36, -108,... geometric?

Accepted Answer

yes

Answer

no

Question 2

Is the sequence -432, 72, -12, 2,...geometric?

Accepted Answer

yes

Answer

no

Question 3

Is the sequence 2, 4, 12, 48,... geometric?

Accepted Answer

no

Answer

yes

Question 4

Is the sequence 7, 9, 12, 16,... geometric?

Accepted Answer

no

Answer

yes

Question 5

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

Accepted Answer

r = -4

Answer

r = 2

Answer

r = -2

Answer

r = 4

Question 6

Find the common ratio: 64, -16, 4, -1, ...

Accepted Answer

r = -1/4

Answer

r = -8

Answer

r = -4

Answer

r = 4

Question 7

Find the common ratio: 16, 8, 4, 2, ...

Accepted Answer

r = 1/2

Answer

r = 2

Answer

r = 8

Answer

r = 1/4

Question 8

Find the common ratio: -3, -9, -27, -81, ...

Accepted Answer

r = 3

Answer

r = 6

Answer

r = -6

Answer

r = -3

Question 9

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

Accepted Answer

1,024

Answer

384

Answer

512

Answer

768

Question 10

Is the sequence geometric or arithmetic?
3, 6, 9, 12...

Accepted Answer

Arithmetic

Answer

Geometric

Answer

Neither

Question 11

Is the sequence geometric or arithmetic?
6, 18, 54...

Accepted Answer

Geometric

Answer

Arithmetic

Answer

Neither

Question 12

Which formula is used to find the explicit equation for geometric sequences?

Accepted Answer

a_n = a₁ * r^n-1

Answer

a_n = a_n-1 + d

Answer

a_n = a_n-1 * r

Answer

a_n = a₁ + d(n-1)

Question 13

Which formula is used to find the recursive equation for geometric sequences?

Accepted Answer

a_n = a_n-1 * r

Answer

a_n = a_n-1 + d

Answer

a_n = a₁ + d(n-1)

Answer

a_n = a₁ * r^n-1

Question 14

Find a₁₂ for the rule a_n = 6(2)^n-1

Accepted Answer

12,288

Answer

4096

Answer

24,576

Answer

2048

Question 15

Find the first four terms of the sequence given the rule:
a₁ = 10: a_n = a_n-1(3)

Accepted Answer

10, 30, 90, 270

Answer

3, 9, 27, 81

Answer

10, 13, 16, 19

Answer

30, 90, 270, 810

Question 16

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

Accepted Answer

4, 20, 100, 500

Answer

20, 100, 500, 2500

Answer

5, 20, 80, 320

Answer

4, 9, 14, 19

Question 17

Write the explicit rule for the geometric sequence:
2, -12, 72, ...

Accepted Answer

a_n = 2(-6)^n-1

Answer

a_n = 72(-6)^n-1

Answer

a_n = 2(6)^n-1

Answer

a_n = 72(-6)^n-1

Question 18

Write the explicit formula for the geometric sequence.

Accepted Answer

a_n = 3(-4)^n-1

Answer

a_n = 4(3)^n-1

Answer

a_n = 3(4)^n-1

Answer

a_n = -4(3)^n-1

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