3 years ago

Help will make you as brain

Mathematics

2 answers:

andre [41]3 years ago

8 0

Annnnsssswwweeeerrrrr:33333

Nooooo

Tomtit [17]3 years ago

7 0

Answer:

you still cant see it

Step-by-step explanation:

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What is AB in the figure?

sweet [91]

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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]

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

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

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3 years ago

Imagine you are filling up a water jug and the water is coming in at rate of 2 liters per 25 seconds. At this rate, how much wat

Zinaida [17]

The answer is 10.8 liters of water

Hope this helps!

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