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mel-nik [20]
4 years ago
13

How to solve 2(x+y)^2-9(x+y)-5​

Mathematics
1 answer:
Aliun [14]4 years ago
6 0

Answer:

2(x + y)² - 9( x + y ) -5 = 0

⇒2(x + y)² - 10 (x+y) +1(x+y) -5 = 0

⇒2(x+y)(x + y - 5 ) + 1(x + y -5 ) = 0

taking (x + y -5 ) common , 

⇒(x + y -5 )[2(x + y) + 1]  =0 

⇒(x + y -5)(2x + 2y +1) =0

hope , you got this 

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The sum of 2 numbers is 84 if one number is 4.less than the other find the numbers​
artcher [175]

Answer:

one number= x = 44

the other number= (x-4)= 40

Step-by-step explanation:

one number= x

the other number= (x-4)

x + (x-4) = 84

2x= 84+4

2x= 88

x= 88/2= 44

one number= x = 44

the other number= (x-4)= 40

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Answer:

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You want to create a 99% confidence interval with a margin of error of .5. Assuming the population standard deviation is equal t
miss Akunina [59]

Answer:

Sample size minimum is 60

Step-by-step explanation:

given that you want to create a 99% confidence interval with a margin of error of .5.

The population  standard deviation is equal to 1.5

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Confidence level = 99%

Since population std deviation is known, we can use Z critical value for finding margin of error

Z critical value for 99% = 2.58

Margin of error = 2.58*\frac{1.5}{\sqrt{n} }

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2.58*\frac{1.5}{\sqrt{n} }=0.5\\\sqrt{n} =7.74\\n =59.90\\n=60

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3 years ago
The diameter of a tree trunk is 23 in. what is the circumference?​
krok68 [10]

Answer:

72.2566311

Step-by-step explanation:

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We don't have the radius, but we do know that half of the diameter is the radius, so 23/2 = 11.5. r = 11.5

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