 Geometric Sequences
4 years ago
melcoffey
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Practice 15 QuestionsShow answers
• Question 1
60 seconds
Q. Is the sequence 2, 4, 12, 48,... geometric?
yes
no
• Question 2
180 seconds
Q. What is the common ratio for the sequence:
28, 14, 7, 3.5...
2
1/2
-14
-7
• Question 3
120 seconds
Q. Find the common ratio: 4, -16, 64, -256, ...
r = -4
r = 2
r = -2
r = 4
• Question 4
120 seconds
Q. Find the common ratio: 64, -16, 4, -1, ...
r = -8
r = -1/4
r = -4
r = 4
• Question 5
180 seconds
Q. Find the next three terms: 4, 12, 36, 108, ...
324, 972, 2916
972, 2916, 8748
405, 1215, 3645
• Question 6
180 seconds
Q. Find the next three terms: -4, -12, -36, -108, ...
36, -108, 324
-324, -972, -2916
324, -972, 2916
-108, 324, -972
• Question 7
900 seconds
Q. Which formula is used to find the explicit equation for geometric sequences?
an = an-1 + d
an = an-1 * r
an = a1 + d(n-1)
an = a1 * rn-1
• Question 8
900 seconds
Q. Which formula is used to find the recursive equation for geometric sequences?
an = an-1 + d
an = an-1 * r
an = a1 + d(n-1)
an = a1 * rn-1
• Question 9
900 seconds
Q. What is the recursive rule for the sequence:
11, 22, 44, 88...
an = 2(11)n-1
an = 11x 2
an = 11(2)n-1
an = 2an-1
• Question 10
120 seconds
Q. Given the sequence:
125, 25, 5, ....
Write the explicit rule:
t(n) = (125)(5)(n)
t(n) = 625(1/5)(n)
t(n) = 625(5)(n)
t(n) = 125 + 5n
• Question 11
30 seconds
Q. Find the general rule for: 64, -32, 16, -8, …
64(1/2)n-1
(-32)n-1
64(-1/2)n-1
(32)n-1
• Question 12
180 seconds
Q. Write an explicit rule for the general term of the sequence 5, 15, 45, . . . ?
an = an-1 x 3
an = 5(3)n-1
an = 3(5)n-1
an = 5 + (n-1)3
• Question 13
30 seconds
Q. Find the 11th term for:  64, -32, 16, -8, …
-.0625
.0625
-.03125
.03125
• Question 14
900 seconds
Q. You have \$10 in you bank account.  It doubles every month.  How much money will you have after 5 months?
\$50
\$35
\$320
\$250
• Question 15
30 seconds
Q. Which sequence is represented by the equation 2(7)n-1 ?