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Elenna [48]
3 years ago
14

a theater holds 2,680 seats. the lower level has 100 less than 2 times as many seats as the upper level. the middle level has 80

more than 3 times as many seats as the upper leveel. how many seats are in the middle level?
Mathematics
2 answers:
sergey [27]3 years ago
5 0

Answer:

b

Step-by-step explanation:

i took it on ed 2020 and got it correct

Genrish500 [490]3 years ago
4 0

x + y + z = 2680 
<span>x = 2z - 100 </span>
<span>y = 3z + 80 </span>
<span>x + y = 5z - 20 </span>
<span>6z - 20 = 2680 </span>
<span>z = 450 </span>
<span>y = 1430 </span>
<span>Solution: </span>
<span>x = 800, y = 1430, z = 450 </span>
<span>The middle level has 1430 seats. </span>
<span> </span>

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Anderson uses the discriminant to correctly find the number of real solutions of the quadratic equation one-halfx2 + 4x + 8 = 0.
amid [387]

Answer:

The discriminant of ax^2+bx+c is b^2-4ac.  

If the discriminant, d, is:

d<0, there are no real solutions (there are two imaginary solutions however)

d=0, there is one real solution

d>0, there are two real solutions

In this case d=16-32=-16 so there are two imaginary solutions.  Or from your answer choices, it can be said that there are no real number solutions becuse the discriminant is less than zero.

3 0
2 years ago
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An instructor believes the distribution of scores on her final exam will have mean 62 and standard deviation 7. Fred is a studen
OLga [1]

Answer:

a) P(47

And then the probability that Fred will not score between 47 and 77 is

1-0.968 = 0.0321

b) P(45

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Part a

Let X the random variable that represent the scores of a population, and for this case we know the distribution for X is given by:

X \sim N(62,7)  

Where \mu=62 and \sigma=7

We are interested on this probability  on the probability that Fred will not score between 47 and 77. So we can begin finding this probability

P(47

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(47

And we can find this probability on this way:

P(-2.143

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(-2.143

And then the probability that Fred will not score between 47 and 77 is

1-0.968 = 0.0321

Part b

P(45

And we can find this probability on this way:

P(-2.429

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(-2.429

7 0
3 years ago
Help with one math question!! 98 points!!!!!!!<br> (ignore selected answer)
Gekata [30.6K]
The answer D is correct
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7 0
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If FX) = 3x+6, which of the following is the inverse of Fx)?
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Answer:

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Answer:

Hiiiii

The answer is 4 + 2 + 7= 13

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