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lana66690 [7]
3 years ago
5

Solve the equation. X2=-180

Mathematics
1 answer:
devlian [24]3 years ago
7 0

Answer:

-90

Step-by-step explanation:

x2 = -180

x = -180/2

x= -90

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A statistician chooses 27 randomly selected dates, and when examining the occupancy records of a particular motel for those date
Anni [7]

Answer:

Confidence interval variance [21.297 ; 64.493]

Confidence interval standard deviation;

4.615, 8.031

Step-by-step explanation:

Given :

Variance, s² = 34.34

Standard deviation, s = 5.86

Sample size, n = 27

Degree of freedom, df = 27 - 1 = 26

Using the relation for the confidence interval :

[s²(n - 1) / X²α/2, n-1] ; [s²(n - 1) / X²1-α/2, n-1]

From the chi distribition table :

X²α/2, n-1 = 41.923 ; X²1-α/2, n-1 = 13.844

Hence,

[34.34*26 / 41.923] ; [34.34*26 / 13.844]

[21.297 ; 64.493]

The 95% confidence interval for the population variance is :

21.297 < σ² < 64.493

Standard deviation is the square root of variance, hence,

The 95% confidence interval for the population standard deviation is :

4.615 < σ < 8.031

3 0
2 years ago
I need help with algebra
rosijanka [135]

Answer:

x = -1 and y = 6

Step-by-step explanation:

using x = -b/2a

x = -4 / 2(2)

x = -1

y = 2(-1)² + 4(-1) + 8

y = 2 - 4 + 8

y = 10 - 4

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4 0
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22. Four years ago, Samantha was three times as old as Danny. Four years fromnow, Samantha will be only twice as old as Danny. H
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Danny is 12 and Samantha is 28
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3 years ago
What does the line 4x y = 17 look like?
olganol [36]
The equation must be 4x + y = 17

I will use the y-intercept slope version

y = - 4x + 17

Then the slope is negative (-4) and the y-intercept is 17.

The line passes through the points (0,17) and (0,17/4). The negative slope indicates that the line goes down from left to right (y decreases when x increases).
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seraphim [82]
{-4x+7y+5=-5
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{-4x+7y+5=-5
{y=5/3 Substitute the value of y.

-4x+7(5/3)+5=-5 Plug in and solve.

x=65/12 You should get this answer.

Therefore: (x,y) = (65/12,5/3)
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