can someone help me with this really fast

Answer:

2

Step-by-step explanation:

10^2 - 8^2 = B^2

B = 2

Answer:

b=6

Step-by-step explanation:

8 squared equals 64, 10 squared equals 100. 100-64 is 36. square root of 36 equals 6. Thus b=6.

Answer: x> −9 /7  and x< 17 /7

Step-by-step explanation:

brainliest:)

Answer:

B

Step-by-step explanation:

Complete Question

The complete question is shown on the first uploaded image

Answer:

The  95% confidence interval is [tex] [670.03  , 673.97 ] [/tex]

The  test statistics is [tex]t = 7.7 [/tex]

The  p-value  is    [tex]p-value  =  0[/tex]

The p-value  suggests that the null hypothesis is rejected with a high degree of confidence. Hence  there is statistically significant evidence that the districts with smaller classes have higher average test score  

Step-by-step explanation:

From the question we are told that

   The sample size is  n =  408

    The sample mean is  [tex]\= y  =  672.0[/tex]

   The standard deviation is  [tex]s = 20.3[/tex]

Given that the confidence level  is 95% then the level of significance is  

   [tex]\alpha = (100 -95 )\% = 0.05[/tex]

From the normal distribution table  the critical value of [tex]\frac{\alpha }{2} = \frac{0.05 }{2}[/tex] is  

    [tex]Z_{\frac{\alpha }{2} } =  1.96[/tex]

Generally  the margin of error is mathematically represented as  

     [tex]E  =  Z_{\frac{\alpha }{2} } *  \frac{s}{\sqrt{n} }[/tex]

=>   [tex]E  =  1.96 *  \frac{20.3}{\sqrt{408} }[/tex]

=>     [tex]E  =  1.970[/tex]

Generally the 95% confidence interval is mathematically represented as

       [tex]\= y -E  < \mu <  \= y + E[/tex]

=>     [tex] 672.0 -1.970  < \mu < 672.0 +1.970[/tex]

=>     [tex] 670.03  < \mu < 673.97[/tex]

=>     [tex] [670.03  , 673.97 ] [/tex]

From the question we are told that

   Class size                                  small                                      large

  [tex]Avg.score(\= y)[/tex]         [tex]\= y_1 = 683.7[/tex]   [tex]\= y_2 =  676.0[/tex]

   [tex]S_y[/tex]                          [tex]S_{y_1} =20.2[/tex]    [tex]S_{y_2} = 18.6[/tex]

   sample size                             [tex]n_1 = 229[/tex]        [tex]n_2 =  184[/tex]

The  null hypothesis is  [tex]H_o :  \mu_1 - \mu_2 = 0[/tex]

The alternative hypothesis is  [tex]H_a :  \mu_1 - \mu_2 > 0[/tex]

Generally the standard error for the difference in mean is mathematically represented as

       [tex]SE =  \sqrt{\frac{S_{y_1}^2 }{n_1} +\frac{S_{y_2}^2 }{n_2}   }[/tex]

=>     [tex]SE =  \sqrt{20.2^2 }{229} +\frac{18.6^2 }{184_2}   }[/tex]

=>     [tex]SE =  1.913[/tex]

Generally the test statistics is mathematically represented as

      [tex]t = \frac{\= y _1 - \= y_2 }{SE}[/tex]

=>    [tex]t = \frac{683.7 - 676.0 }{1.913}[/tex]

=>   [tex]t = 7.7 [/tex]

Generally the p-value is mathematically represented as

    [tex]p-value  =  P(t >  7.7 )[/tex]

From the  z-table

        [tex]P(t >  7.7 ) =  0[/tex]

So

   [tex]p-value  =  0[/tex]

From the values we obtained and calculated we can see that [tex]p-value  <  \alpha[/tex]

This mean that

The p-value  suggests that the null hypothesis is rejected with a high degree of confidence. Hence  there is statistically significant evidence that the districts with smaller classes have higher average test score  

Answer:

79 cups of lemonade

Step-by-step explanation:

47 cups of water plus 32 cups of lemonade mix added together equals 79 cups of lemonade.

Answer:

50

Step-by-step explanation:

Answer:

[tex]f(x)= 2x^{2} - 3x +28\\f(-2) = 2(-2^{2}) - 3(-2) +28\\f(-2) = 8 +6+28\\f(-2) = 42[/tex]

Answer: 0.7 is 10 times larger than 0.07

Step-by-step explanation:

Answer:

C 47

omae wa mou

Answer:

<A= obtuse

<B= acute

<C= obtuse

<D= right

Step-by-step explanation:

what is the question?

Answer:

About 495 people

Step-by-step explanation:

Divide 7428 by 15 years.

Answer:

The area of the rectangle is 12 cm² (to two significant figures)

Step-by-step explanation:

To determine the area of a rectangle that is 2.1-cm wide by 5.6-cm long,

The area of a rectangle is given by

Area = l × w

where l is the length

and w is the width

From the question,

l = 5.6 cm

and w = 2.1 cm

Hence, Area of the given rectangle will be

Area = 5.6 cm × 2.1 cm

Area = 11.76 cm²

Now, we will convert the answer to two significant figures

Then,

Area = 12 cm²

Hence, the area of the rectangle is 12 cm² (to two significant figures)

Answer:

holoiejk

Step-by-step explanation:

answer is y=5x-15 for the parallel line

Answer:

y = 5x - 15

Step-by-step explanation:

Took test.

Answer:

-23

Step-by-step explanation:

Answer:

see below

Step-by-step explanation:

— 7x — бу = — 15

To find the x intercept set y = 0 and solve for x

-7x - 0 = -15

-7x= -15

Divide by -7

-7x/-7 = -15/-7

x = 15/7

The x intercept is (15/7,0)

To find the y intercept set x = 0 and solve for y

o— бу = — 15

— бу= -15

Divide by -6

— бу/-6= -15/-6

у= 5/2

The y intercept is (0,5/2)

Answer:

2x2 −x+3

Step-by-step explanation:

Answer:

a=-1.2

Step-by-step explanation:

5x-10=3x+a=12

let's first find x:

5x-10=12

add 10 to both sides:

5x=22

divide both sides by 5:

x=4.4

now that we know what x is, we can plug it back into the equation to find a:

3*4.4+a=12

first, simplify both sides:

13.2+a=12

then, subtract 13.2 from both sides:

and our answer is: a=-1.2

Answer:

Triangle PQR is an isoceles triangle since PQ=QR, where angle P= angle R (property of isoceles triangle)

Answer:

99.06 meters

Step-by-step explanation:

Answer:

≈ 99.1 meters

Step-by-step explanation:

1 foot = 0.3048 meters

325 / 3.281

99.055166

Best of Luck!

Answer:

(1) The degrees of freedom for unequal variance test is (14, 11).

(2) The decision rule for the 0.01 significance level is;

(3) The value of the test statistic is 0.3796.

Step-by-step explanation:

We are given that you are an expert on the fashion industry and wish to gather information to compare the amount earned per month by models featuring Liz Claiborne's attire with those of Calvin Klein.

The following is the amount ($000) earned per month by a sample of 15 Claiborne models;

$3.5, $5.1, $5.2, $3.6, $5.0, $3.4, $5.3, $6.5, $4.8, $6.3, $5.8, $4.5, $6.3, $4.9, $4.2 .

The following is the amount ($000) earned by a sample of 12 Klein models;

$4.1, $2.5, $1.2, $3.5, $5.1, $2.3, $6.1, $1.2, $1.5, $1.3, $1.8, $2.1.

(1) As we know that for the unequal variance test, we use F-test. The degrees of freedom for the F-test is given by;

[tex]\text{F}_(_n__1-1, n_2-1_)[/tex]

Here, [tex]n_1[/tex] = sample of 15 Claiborne models

         [tex]n_2[/tex] = sample of 12 Klein models

So, the degrees of freedom = ([tex]n_1-1, n_2-1[/tex]) = (15 - 1, 12 - 1) = (14, 11)

(2) The decision rule for 0.01 significance level is given by;

(3) The test statistics that will be used here is F-test which is given by;

                          T.S. = [tex]\frac{s_1^{2} }{s_2^{2} } \times \frac{\sigma_2^{2} }{\sigma_1^{2} }[/tex]  ~ [tex]\text{F}_(_n__1-1, n_2-1_)[/tex]

where, [tex]s_1^{2}[/tex] = sample variance of the Claiborne models data = [tex]\frac{\sum (X_i-\bar X)^{2} }{n_1-1}[/tex] = 1.007

[tex]s_2^{2}[/tex] = sample variance of the Klein models data = [tex]\frac{\sum (X_i-\bar X)^{2} }{n_2-1}[/tex] = 2.653    

So, the test statistics =  [tex]\frac{1.007}{2.653 } \times 1[/tex]  ~ [tex]\text{F}_(_1_4,_1_1_)[/tex]

                                   = 0.3796

Hence, the value of the test statistic is 0.3796.

Answer:

8

Step-by-step explanation:

72x(2/3)=48

48/6=8

Answer:

deena

Step-by-step explanation:

585/9=65mph

605/11=55mph

brainliest plz

Answer:

Deena

Step-by-step explanation:

Deena drove 585 miles in 9 hours divide 585 by 9=65

Kristen drove 605 miles in 11 hours divide 605 by 11=55

Answer:

Step-by-step explanation:

6cm