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fenix001 [56]
3 years ago
15

MEGA POINTS... CAN CHAT AFTERWARDS...

Mathematics
1 answer:
slega [8]3 years ago
8 0

Answer:

B

Step-by-step explanation:

Given

x² - 18x + --- = 4 + ----

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(- 9)x + 81 = 4 + 81

(x - 9)² = 85 ( take the square root of both sides )

x - 9 = ± \sqrt{85} ( add 9 to both sides )

x = 9 ± \sqrt{85}  ← exact solutions

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The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airp
yKpoI14uk [10]

Answer:

Confidence Interval in 95% confidence level for the quality rating is (6.06,7.46)

Step-by-step explanation:

Confidence Interval can be calculated using the formula M±ME where

  • M is the mean of the sample
  • ME is the margin of error in a given confidence level

Using the sample obtained from 50 business travelers we get

  • Mean of the sample is 6.76
  • standard deviation of the sample is 2.526

Margin of error (ME) around the mean using the formula

ME=\frac{z*s}{\sqrt{N} } where

  • z is the corresponding statistic in 95% confidence level (1.96)
  • s is the standard deviation of the sample (2.526)
  • N is the sample size (50)

Using the numbers in the formula we get:

ME=\frac{1.96*2.526}{\sqrt{50} } ≈ 0.70

Then the confidence interval becomes 6.76±0.70

6 0
3 years ago
Y=x+1<br> y+x=5<br> Cant figure out what i am suppose to do with this problem
exis [7]

Answer:can you give me more detail

Step-by-step explanation:

8 0
3 years ago
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Answer:

0=0

Step-by-step explanation:

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HL

Step-by-step explanation:

It's a right triangle.

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Answer:

(-1 , 2) Not part of the solution

Step-by-step explanation:

from the graph:

(0 , 0) in the red part ⇒ it's a solution

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