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18 questions
Write a formula for the following sequence:
5, 8, 11, 14, 17...
a_{n} = 3n + 2
a_{n} = 8 - 5n
a_{n} = 5(3)^{n-1}
a_{n} = 5 + 3n
Write a formula for the following sequence:
4, 12, 36, 108...
a_{n} = 4(3^{n-1})
a_{n} = 4(3^{n})
a_{n} = 4+3n
a_{n} = 4(3n)
Find a_{18} for the following geometric sequence,
-3, 6, -12, 24,,,
-37
-786,432
393,216
258,280,326
For an arithmetic sequence, f(1)=⅘ and the common difference is -1. What is f(20)?
18 ⅕
−⅕
−20 ⅕
−18 ⅕
Given a_{1} = 3 and a_{6}= 13, what is the common difference?
2
3
10
1
$\sum_{x=4}^{39}\left(5x+2\right)\$ Find the sum
3125
3942
3623
3952
Given the sequence:
125, 25, 5, ....
Write the rule a_{n} using the geometric sequence formula:
a_{n} = (125)(1/5)^{(n-1)}
a_{n} = 625(1/5)^{(n-1)}
a_{n} = 625(5)^{(n-1)}
a_{n} = 125 + 5n
This is an arithmetic sequence. 8, 7.3, 6.6, 5.9, . . .
What function describes the sequence?
f (x) = −0.7x + 8
f (x) = −0.7x + 8.7
f (x) = 0.7x + 8
f (x) = 0.7x + 8.7
Find the next three terms of the following geometric sequence:
4, 12, 36, 108, ...
324, 972, 2916
972, 2916, 8748
405, 1215, 3645
324, 648, 1296
Find the sum of the geometric series.
2 + 12 + 72 + 432
432
518
211
438
Evaluate $\sum_{k\ =\ 1}^7\left(-2\right)^{k\ -1\ }$
44
$\frac{1}{3}$
43
49
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