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lidiya [134]
3 years ago
6

Plz hurry

Mathematics
2 answers:
marishachu [46]3 years ago
8 0

Answer:

n= -13/4

Step-by-step explanation:

Bezzdna [24]3 years ago
7 0
N=-13/4 because you subtract 3/4 from -5/2
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You have a cable that costs $39 a month for a basic plan plus one movie channel. Your friend has the same basic plan plus two mo
mina [271]
32.50, 

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<span>39 - 6.50 = 32.50 (the cost of cable without any movie channels) </span>

<span>Proof </span>
<span>32.50+6.50+6.50 = 45.50 </span>
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Find the sum of the series 9+3+1+........+1/27​
Elina [12.6K]

Answer:

364/27

Step-by-step explanation:

9, 3, 1, ... is a geometric sequence with common ratio r = 1/3.

 

The nth term is a1rn-1.

 

If a1rn-1 = 1/27, then 9(1/3)n-1 = 1/27

 

                                32(3-1)n-1 = 3-3

 

                                3231-n = 3-3

 

                                    33-n = 3-3

 

                                      3-n = -3

 

                                         n = 6

 

The sum, Sn, of the first n terms of a geometric sequence is given by Sn = a1(1 - rn) / (1 - r).

 

So, 9 + 3 + 1 + ... + 1/27 = S6 = 9(1 - (1/3)6) / (1 - 1/3)

 

                                              = 9(1 - 1/729) / (2/3)

 

                                              = (27/2)(728/729) = 364/27

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Jason wants to earn money by raking leaves. He buys a rake that
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Answer: he will be charging them 70% less than what the rake cost.

Step-by-step explanation:

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