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Degger [83]
2 years ago
13

What are the steps for x2-11=-2

Mathematics
2 answers:
Rama09 [41]2 years ago
8 0

Answer:

x=3

Step-by-step explanation:

x^2=9

x=3

Mashcka [7]2 years ago
5 0

Answer:

x = ±3

Step-by-step explanation:

x^2-11=-2

Add 11 to each side

x^2-11+11=-2+11

x^2 = 9

Take the square root of each side

sqrt(x^2) = ±sqrt(9)

x = ±3

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WILL MARK BRAINLIEST In this geometric sequence, what is the common ratio? 104, -52, 26, -13, ...
Lilit [14]

Answer:

r = - \frac{1}{2}

Step-by-step explanation:

The common ratio r of a geometric sequence is

r = \frac{a_{2} }{a_{1} } = \frac{a_{3} }{a_{2} } = .....

Hence

r = \frac{-52}{104} = \frac{26}{-52} = - \frac{1}{2}

8 0
3 years ago
In Triangle A B C, what is the value of x? Triangle A B C. Angle A is (10 x minus 10) degrees, angle B is (8 x) degrees, angle C
svp [43]

Answer:

6.5

Step-by-step explanation:

The sum of all angles in a triangle are 180 degrees.

=> 10x -10 + 8x + 10x + 8 = 180

=> 28x -2 = 180

=> 28x = 182

=> x = 6.5

So, Angle A = 10 x 6.5 -10 = 65 - 10 = 55 degrees

     Angle B = 8 x 6.5 = 52 degrees

     Angle C = 10 x 6.5 + 8 = 65 + 8 = 73 degrees.

55 + 52 + 73 = 55 + 125 = 180 degrees

6 0
3 years ago
(19,-9) (-7,-15) in slope intercept form
never [62]

Answer:

y=\frac{3}{13}x-\frac{174}{13}

Step-by-step explanation:

slope:

m=\frac{-15-(-9)}{-7-19} =\frac{-15+9}{-26} =\frac{-6}{-26} =\frac{3}{13}

Equation, with the point (19, -9):

y-(-9)=\frac{3}{13} (x-19)

y+9=\frac{3}{13} x-\frac{57}{13}

y=\frac{3}{13} x-\frac{57}{13} -9

                                      -9=-9(\frac{13}{13} )=-\frac{117}{13}

y=\frac{3}{13}x-\frac{174}{13}

Hope this helps

8 0
2 years ago
Write following ratio in simplest form : <br> 125 g : 1 kg​
Dmitry [639]

Answer:

125g:1Kg

=> 125g : 1000g

<h3>=> 1:4</h3>

5 0
3 years ago
Read 2 more answers
A fast food restaurant executive wishes to know how many fast food meals teenagers eat each week. They want to construct a 99% c
Lana71 [14]

Answer:

The minimum sample size required to create the specified confidence interval is 2229.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.99}{2} = 0.005

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.005 = 0.995, so z = 2.575

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

What is the minimum sample size required to create the specified confidence interval

This is n when M = 0.06, \sigma = 1.1

0.06 = 2.575*\frac{1.1}{\sqrt{n}}

0.06\sqrt{n} = 2.575*1.1

\sqrt{n} = \frac{2.575*1.1}{0.06}

(\sqrt{n})^{2} = (\frac{2.575*1.1}{0.06})^{2}

n = 2228.6

Rounding up

The minimum sample size required to create the specified confidence interval is 2229.

7 0
3 years ago
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