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Darina [25.2K]
4 years ago
7

Simplify -3+i/7 + i

Mathematics
2 answers:
olchik [2.2K]4 years ago
8 0

Answer:

D. 7 - i

Step-by-step explanation:

(-3+i)/(7 + i)=

(-3+i)(7-i)/(7+i)(7-i)=

(-21+10i+1)/50=

(10i-20)/50=

0.2i-0.4

nika2105 [10]4 years ago
3 0
The answer is C.7+i
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Part 1:

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The sampling error is given by:

\bar{x}-\mu=3.8-4.27=-0.47



Part 2:

Given a number line with the point \bar{x}=26.43 and the point \mu=24.67

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\bar{x}-\mu=26.43-24.67=1.76
4 0
3 years ago
Maths equation : solve (2 - x)² < 4/25​
ipn [44]

Answer:

8/5 < x < 12/5

Step-by-step explanation:

(2 - x)² < 4/25​

2 - x < ±2/5

2 - x < 2/5

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x > 8/5

2 - x > -2/5

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Therefore, your answer is 8/5 < x < 12/5

8 0
3 years ago
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Katyanochek1 [597]

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6 0
3 years ago
In how many ways can 4 singers be selected from 8 who came to an audition?
elena-s [515]

The first selection can be any one of the 8. 
               For each one ...
The second selection can be any one of the remaining 7. 
               For each one ...
The third selection can be any one of the remaining 6. 
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The fourth selection can be any one of the remaining 5.

Total number of ways to select four = (8 x 7 x 6 x 5) = 1,680 ways

BUT ... There are not 1,680 different groups of 4 .

Each group of 4 can be selected in (4 x 3 x 2) = 24 different ways.

So, although there are 1,680 different ways to select 4 singers,
there are only
                           (1,680 / 24) = 70 different groups of 4
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7 0
4 years ago
Which of the following describes the function shown in the table below? x y -4 16 -1 2 2 0.25 4 0.0625 5 0.03125 exponential, th
wolverine [178]

A statement which best describes the function shown in the table is: B. exponential, there is a continual rate of decay or decrease.

<h3>What is an exponential function?</h3>

An exponential function is a mathematical function whose numerical values (numerals) are generated by a constant that is raised to the power of an argument.

<u>Given the following table:</u>

X : -4        -1        2            4              5

Y :  16        2       0.25   0.0625    0.03125

Next, we would calculate the rate of decay for the y-values:

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<u>Rule:</u> The y-values constantly decreases by 1/4 or 0.25 of the previous number.

In conclusion, we can logically deduce that the function shown in the table is exponential, there is a continual rate of decay or decrease.

Read more on exponential functions here: brainly.com/question/12940982

#SPJ1

3 0
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