Geometric Sequences | Mathematics - Quizizz

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Geometric Sequences

9th - 12th grade

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Slide 1
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Geometric Sequences
At this point, you should have already watched the teacher time notes. Please use this activity to solidfy your knowledge on Geometric Sequences before taking the "Ticket" for this lesson.
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Slide 2
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Determine if a sequence is geometric

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Question 3
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Q. Is the sequence 2, 4, 12, 48,... geometric?
answer choices
yes
no
yes
alternatives
no
answer explanation
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Question 4
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Q. Is the sequence 256, 64, 16, 4,... geometric?
answer choices
yes
no
yes
alternatives
no
answer explanation
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Slide 5
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Find the common ratio

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Question 6
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Q. What is the common ratio of the geometric sequence below?
5, 25, 125, 625...
answer choices
25
20
5
4
25
alternatives
20
5
4
answer explanation
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Question 7
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Q. Find the common ratio: 4, -16, 64, -256, ...
answer choices
r = -4
r = 2
r = -2
r = 4
r = -4
alternatives
r = 2
r = -2
r = 4
answer explanation
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Slide 8
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Find the next three terms

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Question 9
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Q. Find the next three terms: -4, -12, -36, -108, ...
answer choices
36, -108, 324
-324, -972, -2916
324, -972, 2916
-108, 324, -972
36, -108, 324
alternatives
-324, -972, -2916
324, -972, 2916
-108, 324, -972
answer explanation
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Question 10
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Q. Find the next three terms: 4, 12, 36, 108, ...
answer choices
324, 972, 2916
972, 2916, 8748
405, 1215, 3645
324, 972, 2916
alternatives
972, 2916, 8748
405, 1215, 3645
answer explanation
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Slide 11
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Question 12
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Q. Find the 11^th term for: 64, -32, 16, -8, …
answer choices
-.0625
.0625
-.03125
.03125
-.0625
alternatives
.0625
-.03125
.03125
answer explanation
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Question 13
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Q. Which sequence is represented by the equation 2(7)^n-1 ?
answer choices
7, 14, 28, 56...
2, 14, 98, 686...
2, 9, 16, 23...
7,9,11,13...
7, 14, 28, 56...
alternatives
2, 14, 98, 686...
2, 9, 16, 23...
7,9,11,13...
answer explanation
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Question 14
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Q. Write an explicit rule for the general term of the sequence 5, 15, 45, . . . ?
answer choices
a_n = a_n-1 x 3
a_n = 5(3)^n-1
a_n = 3(5)^n-1
a_n = 5 + (n-1)3
a<sub>n</sub> = a<sub>n-1</sub> x 3
alternatives
a<sub>n</sub> = 5(3)<sup>n-1</sup>
a<sub>n</sub> = 3(5)<sup>n-1</sup>
a<sub>n</sub> = 5 + (n-1)3
answer explanation
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