3 years ago

2(2b+2cd)(2+b) (2a+7)

Mathematics

1 answer:

Dvinal [7]3 years ago

7 0

Step-by-step explanation:

The answer to the first one is: 4cd+4b.

The answer to the second one is: 2ab+4a+7b+14

(I'm assuming that you want to simplify)

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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]

$\bf \qquad \qquad \textit{sum of a finite geometric sequence}
\\\\
S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad 
\begin{cases}
n=n^{th}\ term\\
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----------\\
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\end{cases}$

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

Find the diameter of a circle whose Circumfrence is 66 m

Ilya [14]

Answer:

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Step-by-step explanation: