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Pani-rosa [81]
3 years ago
14

BRAINLIEST AND 50 PTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!HURRY!!!!!!!!!!!!!

Mathematics
1 answer:
Lana71 [14]3 years ago
6 0

Answer:

Step-by-step explanation

(8 * 10) + ( 2 * \frac{1}{100} ) + ( 9 * \frac{1}{1000} )

⇒ 80 + ( 2 * 0.01 ) + ( 9 * 0.001 )

⇒ 80 + 0.02 + 0.009

= 80.029

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Factor over the complex numbers, if possible: x² + 2xyi - y2<br><br> What is the answer?
yanalaym [24]

9514 1404 393

Answer:

  (x +yi)²

Step-by-step explanation:

Comparing the given expression to the square of a binomial, we can determine the given expression to be a square.

  (a +b)² = a² +2ab +b²

Here, we have a=x and b=yi. Then the factorization is ...

  x² +2xyi +(yi)² = (x +yi)²

8 0
3 years ago
Someone help please, i cant solve this one :|
andrey2020 [161]

Answer:

i think its B

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Can someone help me graph these?
Neporo4naja [7]

Answer:

see below

Step-by-step explanation:

x ≤ 3

There is a closed circle at 3 because of the equals sign

the lines goes to the left since it is less than

x < 3

There is a open circle at 3 because there is no equals sign

the lines goes to the left since it is less than

3 0
3 years ago
The average time a subscriber spends reading the local newspaper is 49 minutes. Assume the standard deviation is 16 minutes and
Karolina [17]

Answer:

They spend at least 69.48 minutes reading the paper.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 49, \sigma = 16

For the 10% who spend the most time reading the paper, how much time do they spend?

They spend at least X minutes, in which X is the value of X when Z has a pvalue of 0.90. So it is X when Z = 1.28.

Z = \frac{X - \mu}{\sigma}

1.28 = \frac{X - 49}{16}

X - 49 = 16*1.28

X = 69.48

They spend at least 69.48 minutes reading the paper.

6 0
3 years ago
What probability expression is equivalent to P( / z / &gt; 1.96)?
Sonbull [250]

Answer:

Please check the explanation.

Step-by-step explanation:

Given

P(Z > 1.96)

To determine

What probability expression is equivalent to P(Z > 1.96)

Suppose Z is a standard normal variable.

Therefore,

P(Z > 1.96) = 1 - P(Z ≤ 1.96)

solving

                 = 1 - Ф(1.96)

                 = 1 - 0.9750

                 = 0.0250

6 0
2 years ago
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