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makvit [3.9K]
4 years ago
7

What number must be added to the expression below to complete the square?

Mathematics
2 answers:
Lera25 [3.4K]4 years ago
5 0

Answer:

The correct option is C.

Step-by-step explanation:

The given expression is

x^2-22x                 ....(1)

The perfect square is defined as

(x-y)^2=x^2-2xy+y^2                  ....(2)

On comparing (1) and (2) we get

2y=22

y=11

To making perfect square we have to add y² in the given expression.

y^2=(11)^2=121

Therefore the correct option is C.

Elina [12.6K]4 years ago
3 0
22/2=11
11^2=121, or C, would complete the square
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Answer:

A) sample mean = $1.36 million

B) standard deviation = $0.9189 million

C) confidence interval = ($1.93 million , $0.79 million)

*since the sample size is very small, the confidence interval is not valid.

Step-by-step explanation:

samples:

  1. $2.7 million
  2. $2.4 million
  3. $2.2 million
  4. $2 million
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the standard deviation:

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standard deviation = √0.8444 = 0.9189

95% confidence interval = mean +/- 1.96 standard deviations/√n:

$1.36 million + [(1.96 x $0.9189 million)/√10] = $1.36 million + $0.57 million = $1.93 million

$1.36 million - $0.57 million = $0.79 million

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