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svlad2 [7]
3 years ago
5

Help me Ill Give Brainliest

Mathematics
1 answer:
worty [1.4K]3 years ago
3 0

Answer:b

Step-by-step explanation: i just did it

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What is the first term in a geometric sequence if the common ratio is − 2 and the sum of the first six terms is −105?
Serggg [28]
\bf \qquad \qquad \textit{sum of a finite geometric sequence}
\\\\
S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
r=\textit{common ratio}\\
----------\\
r=-2\\
n=6\\
S_6=-105
\end{cases}

\bf -105=a_1\left( \cfrac{1-(-2)^6}{1-(-2)} \right)\implies -105=a_1\left( \cfrac{1-(64)}{1+2} \right)
\\\\\\
-105=a_1\left( \cfrac{-63}{3} \right)\implies -105=a_1(-21)
\\\\\\
\cfrac{-105}{-21}=a_1\implies 5=a_1
7 0
3 years ago
Can Someone Help Me Please
iren2701 [21]

Answer:

b

Step-by-step explanation:

6 0
3 years ago
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Suppose A and B represent two different school populations where A > B and A and B must be greater than 0. Which of the follo
lina2011 [118]
C. A^2 +B^2 will be the largest because we know that (a+b)^2 = a^2 +2ab +b^2

so than you check these other choices this ie the largest sure 

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4 years ago
Please answer correctly !!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!
Liula [17]

Answer:

  8 5 5

Step-by-step explanation:

Line 3 sets t = 5

Line 5 sets n = t = 5

Line 6 sets c = n+3 = 8

The displayed values for c, n, are

  8 5 5

6 0
3 years ago
2•2 divided by 2+2-2=
dsp73
The answer would be 2.
7 0
3 years ago
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