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Assoli18 [71]
3 years ago
15

81/15 + -14/5 plz it is for a test

Mathematics
2 answers:
kolezko [41]3 years ago
7 0

Answer:

2.6

Step-by-step explanation:

81/15 -> 5.4

-14/5 -> -2.8

when you add a negative it is the same as subtracting the positive value (positive 2.8) and you get 2.6 :)

Natali [406]3 years ago
6 0

Answer:

13/5 and/or 2.6

Step-by-step explanation:

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Please guys this is easy, I need help ASAP! (Giving brainliest)!
jasenka [17]

Answer:

4a. 13

4b. -4

Step-by-step explanation:

2x-6/5 = 4 (Muti each side by 5)

2x-6 = 20

2x = 26 (Divide each side by 2)

x = 13

7- 2x/4 = 9

-2x/4 = 2 (Muti each side by 4)

-2x = 8 (Divide each side by -2)

x = -4

5 0
3 years ago
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tatuchka [14]
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4 0
3 years ago
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Pani-rosa [81]
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7 0
3 years ago
What is the sum of the geometric series in which a1 = −5, r = 3, and an = −405?
xxMikexx [17]
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}
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3 years ago
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