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Alex Ar [27]
3 years ago
15

Need help with this question!

Mathematics
1 answer:
adell [148]3 years ago
7 0

Answer:

im sorry

Step-by-step explanation:

i dont know

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PLS help I will give brainliest​
Savatey [412]

Answer: 1= X = 8

              2= X = 6

              3= X = 7

              4=  X= 9/13 or X= 0.692307

Step-by-step explanation: hope this helps pls mark me brainliest

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3 years ago
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What is the sum of the geometric series in which a1 = −5, r = 3, and an = −405?
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a_1=-5;\ r=3;\ a_n=-405\\\\a_n=a_1r^{n-1}\\\\subtitute\\\\-5\cdot3^{n-1}=-405\ \ \ |divide\ both\ sides\ by\ (-5)\\\\3^{n-1}=81\\\\3^{n-1}=3^4\iff n-1=4\to n=5\\\\S_n=\dfrac{a_1(1-r^n)}{1-r}\\\\S_5=\dfrac{-5(1-3^5)}{1-3}=\dfrac{-5(1-243)}{-2}=\dfrac{5\cdot(-242)}{2}=5\cdot(-121)=-605\\\\\\Answer:\boxed{S_5=-605}
4 0
4 years ago
Solve please I don’t know how to do this.
nadya68 [22]

Answer:

n=40

Step-by-step explanation:

8 0
3 years ago
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4 years ago
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What is 22 + 5d = -8(7d-4)
ratelena [41]

22+5d=-8x7d=56d+ -8x-4=32

22+5d=-56d+32

22+32=54 and -56d+5d=-51d

The answer would be 51d+54

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3 years ago
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