3 years ago

WILL GIVE YOU BRAINLIEST PLUS 15 POINTS!!!

Mathematics

2 answers:

vagabundo [1.1K]3 years ago

7 0

Answer:

11 angles

Step-by-step explanation:

AysviL [449]3 years ago

5 0

11-gon is 9⇥180 = 1620

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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]

$\bf \qquad \qquad \textit{sum of a finite geometric sequence}
\\\\
S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
r=\textit{common ratio}\\
----------\\
r=-2\\
n=6\\
S_6=-105
\end{cases}$

$\bf -105=a_1\left( \cfrac{1-(-2)^6}{1-(-2)} \right)\implies -105=a_1\left( \cfrac{1-(64)}{1+2} \right)
\\\\\\
-105=a_1\left( \cfrac{-63}{3} \right)\implies -105=a_1(-21)
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\cfrac{-105}{-21}=a_1\implies 5=a_1$

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3 years ago

Susan walked 1 2/3 miles in 1 1/4 hours. How many miles can Susan walk in 1 hour?

Amiraneli [1.4K]

Answer:

my gurl susan walked for...

Step-by-step explanation:

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5 0

3 years ago

I will mark the brainiest answer if answer is accurate!

Elodia [21]