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Mathematics

2 answers:

Pani-rosa [81]3 years ago

6 0

Answer:

y=-13

Step-by-step explanation:

plz mark brainliest

KiRa [710]3 years ago

3 0

Answer:

it's negative 13, or y = -13

Step-by-step explanation:

positive times negative gets you negative and then when you subtract 3 it becomes -13

hope this helped have a good day bye byeeeee

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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

A. 1/2<br> B. 1/4<br> C. 4/5<br> D. 1/5

Lynna [10]

It's is C. 4/5 I don't know that math

4 0

3 years ago

Read 2 more answers

-40•(-1/8) help????? Confused??

Wittaler [7]

Hi BellaMore,

Solve -40 x (-1/8)