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Ipatiy [6.2K]
3 years ago
15

Find the ninth partial sum of infinite sumnation 3i-4

Mathematics
1 answer:
snow_tiger [21]3 years ago
3 0
\bf \sum\limits_{i=1}^9\ 3i-4\implies \sum\limits_{i=1}^9\ 3i-\sum\limits_{i=1}^9\ 4\implies 3\sum\limits_{i=1}^9\ i-\sum\limits_{i=1}^9\ 4
\\\\\\
3\cdot  \cfrac{9(9+1)}{2}-(9\cdot 4)

and surely you know how much that is.
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the larger of two number is nine more than four times the smaller number. the sum of the two numbers is fifty-nine. find the two
VLD [36.1K]
This is solved by setting up two equations and then using one to answer the other.
The first step (use what is given to set up the two separate equations)
We are looking for two numbers, let us call them X and Y. 
We are told that X + Y = 59
 We are also told that (9 more than) 9+ (4times the smaller number) 4Y is the bigger number X
Then we combine that into 9+4Y=X
so we now have two separate equations and we can use one to solve the other. Everywhere we have X in the first equation, we will fill in with the second equation
(9+4Y) +Y = 59    [then combine like terms]
9+5Y=59            [subtract 9 from both sides]
5Y=50                   [divide both sides by 5 to isolate the Y]
Y=10                      [now plug this into either equation to solve for X]
9+4(10)=X
9+40=X
<u><em>49=X and 10=Y</em></u>
4 0
3 years ago
How much of the circle is shaded 1/4+3/7
Snezhnost [94]
I hope this helps you



1/4+3/7


7/7.4+3.4/7.4


7/28+12/28

19/28
4 0
3 years ago
Need to know b and c : picture available ; worth 10 points
bulgar [2K]
B;

$6.00 lb + 15%  = 6.00 x 1.15 = $6.90

$6.90 x 2.6lbs = $17.94

C;

New price is $.90 more.

3.5 x .90 = $3.15 more



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3 years ago
18x 24x greatest common factor
zzz [600]
18x and 24x.....GCF = 6x
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What is the volume of a cylinder with a height of 15 iches and radius of 3 inches????
uysha [10]
It would be 424.12in³
5 0
3 years ago
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