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g100num [7]
3 years ago
13

When 0.3(4x-8)-0.5(-2.4x+4) is simplified what is the resulting expression

Mathematics
2 answers:
Fantom [35]3 years ago
3 0

Answer:

2.4x-4.4

Step-by-step explanation:

The first step to simplify this expression is to expand the terms in  parenthesis

Sever21 [200]3 years ago
3 0

Answer:

D. 2.4x - 4.4

Step-by-step explanation:

This is 100% the answer.

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The average telephone bill in a locality is $70, with a standard deviation of $40. In a sample of 50 randomly selected phone con
Sever21 [200]

Using the normal distribution, there is a 0.1894 = 18.94% probability that the sample average will exceed $75.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean \mu and standard deviation \sigma is given by:

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

  • The z-score measures how many standard deviations the measure is above or below the mean.
  • Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.
  • By the Central Limit Theorem, the sampling distribution of sample means of size n has standard deviation s = \frac{\sigma}{\sqrt{n}}.

The parameters for this problem are given as follows:

\mu = 70, \sigma = 40, n = 50, s = \frac{40}{\sqrt{50}} = 5.66

The probability that the sample average will exceed $75 is <u>one subtracted by the p-value of Z when X = 75,</u> hence:

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

By the Central Limit Theorem

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

Z = (75 - 70)/5.66

Z = 0.88

Z = 0.88 has a p-value of 0.8106.

1 - 0.8106 = 0.1894.

0.1894 = 18.94% probability that the sample average will exceed $75.

More can be learned about the normal distribution at brainly.com/question/28096232

#SPJ1

3 0
2 years ago
Whats 2+2-1+17-9+29-9=<br><br><br><br> Hows your day
grigory [225]

Answer:

31 is the answer of this question

3 0
3 years ago
Read 2 more answers
a cactus casts a shadow that is 15ft long. a gate nearby cast a shadow that is 5 ft long. find the height of the cactus
UNO [17]
The height of the cactus is three times the height of the gate
5 0
2 years ago
Find the value of x.
kirza4 [7]
Hey there :)

Here we need to use Trigonometry!

The given angle is 61°
The opposite to the angle is 22 
So x is the adjacent

The trigonometric ratio that uses opposite and adjacent is tan
( I have uploaded a picture to help you )


tan α = \frac{opposite}{adjacent}
tan 61 = \frac{22}{adj}
adj = \frac{22}{tan(61)}
adj ≈ 12.19 ≈ 12

x = 12


5 0
3 years ago
Find the value of X and y .If order pair (X,y)=(6,7)​
Darina [25.2K]

Answer:

x=6,y=7

Step-by-step explanation:

In a coordinate pair it is assumed that the first number is x, and the 2nd is y.

7 0
3 years ago
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