3 years ago

Ethod

Mathematics

1 answer:

kherson [118]3 years ago

7 0

Answer: The answer is C

Step-by-step explanation: Just took the test on E D G E and it was C

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10x + 11 - x= 5x - 13

sergeinik [125]

Answer:

x= -6

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable

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3 years ago

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

What is that as a single power

Damm [24]

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4 years ago

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Need to know the surface area please help me figure out how to solve it

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