3 years ago

What is 9+10 haha yes

Mathematics

2 answers:

BigorU [14]3 years ago

5 0

Answer:

its 4.............jk lol

Lena [83]3 years ago

4 0

Answer:

21 no just kidding 19

Step-by-step explanation:

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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

PLS HELP ASAP! GIVING BRAINLY

ioda

The answer would be (x+1) and (x+10) so E

4 0

3 years ago

Read 2 more answers

Help me plz lol 25×35×112

azamat

Answer:

98000

Step-by-step explanation:

25*35=875

875*112=98000

7 0

3 years ago

In febuary, john has $1000 in his account. in may, he had 2600. what is the rate of change?

sergiy2304 [10]

Answer:

866.7 each month

Step-by-step explanation:

what you would do is count how many months are in between which is 3 and then you would divide 2600 by 3 and get 866.7 so the rate of change is 866.7 each month

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3 years ago

M=72-0.75n can anyone explain how i can find both m and n plz

kari74 [83]

Answer:M is M=-0.75 and +72 and N is n= -1.3M+96

Step-by-step explanation:

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3 years ago