Change in Arithmetic and Geometric Sequences
AP Precalculus · Flashcards · Application
AP PRECALCULUS · FLASHCARDS
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QUESTION
Find the number of terms in the geometric sequence:
1
,
3
,
9
,
...
,
81
1, 3, 9, \text{...}, 81
1
,
3
,
9
,
...
,
81
QUESTION
Find the common difference:
7
,
10
,
13
,
16
,
...
7, 10, 13, 16, \text{...}
7
,
10
,
13
,
16
,
...
QUESTION
What is the first term if
a
5
=
21
a_{5} = 21
a
5
=
21
and
d
=
5
d = 5
d
=
5
?
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ANSWER
1
1
1
. From
a
5
=
a
1
+
4
d
=
21
a_5 = a_1 + 4d = 21
a
5
=
a
1
+
4
d
=
21
, solve:
a
1
=
21
−
4
(
5
)
=
1
a_1 = 21 - 4(5) = 1
a
1
=
21
−
4
(
5
)
=
1
.
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