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Aleonysh [2.5K]
2 years ago
6

What is -8(x-2)-20= -4

Mathematics
1 answer:
OLEGan [10]2 years ago
3 0

Answer:

0

Step-by-step explanation:

If this helps please put brainliest

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Can you answer this correctly please
Julli [10]

Answer:

option 1

Step-by-step explanation:

temperature of 76.1°F converted to Celsius

6 0
2 years ago
A major retail clothing store is interested in estimating the difference in mean monthly purchases by customers who use the stor
faust18 [17]

Answer:

Critical value is t = 1.9901

Step-by-step explanation:

We are given the results of the sampling :

                                     In-House Credit Card                National Credit Card                    <u>Sample Size</u> :                              32                                                    50

<u>Mean Monthly Purchases </u>:      $45.67                                            $39.87

<u>Standard Deviation </u>:                $10.90                                             $12.47

Also, the managers wished to test whether there is a statistical difference in the mean monthly purchases by customers using the two types of credit cards, using a significance level α of 0.05.

<em>Firstly, we will specify our null and alternate hypothesis;</em>

Let \mu_1 = Mean Monthly Purchases of In-House Credit Card

     \mu_2 = Mean Monthly purchases of National Credit Card

So, Null Hypothesis, H_0 : \mu_1-\mu_2 = 0  {means that there is no difference in the mean monthly purchases by customers using the two types of credit cards}

Alternate Hypothesis, H_0 : \mu_1-\mu_2\neq 0  {means that there is statistical difference in the mean monthly purchases by customers using the two types of credit cards}

The test statistics that will be used here is <u>Two-sample t-test statistics</u>;

              T.S. = \frac{(\bar X_1-\bar X_2)-(\mu_1-\mu_2)}{s_p \sqrt{\frac{1}{n_1}+\frac{1}{n_2}  } }  ~ t_n___1+n_2-_2

where, \bar X_1 = Sample mean Purchases of In-House Credit Card = $45.67

           \bar X_2 = Sample mean Purchases of National Credit Card = $39.87

            s_p = pooled variance

            n_1 = In-house credit card sample = 32

            n_2 = National credit card sample = 50

So, degree of freedom of t-value here is (32 + 50 - 2) = 80

Now, at 0.05 significance level, t table gives critical value of t = 1.9901 at 80 degree of freedom.

<em>Therefore, the critical value assuming the population standard deviations are not known but that the populations are normally distributed with equal variances is t = 1.9901.</em>

3 0
3 years ago
Find x:<br> 16<br> 1<br> A<br> K<br> 9<br> С<br> X<br> case of sit<br> B
Alexxx [7]

Answer: x = 9

Step-by-step explanation:

9/x = x/16

y^2 + 16^2 = 49

root 16^3= 16 - y

square root 49 = 7

y is the variable for this example

16 - y = 16 - 7 because y = 7

16 - 7 = 9

x = 9

6 0
3 years ago
The perimeter of a rectangle is 360 centimetres. If the ratio of its length to its width is 11:4, find the dimensions of the rec
xz_007 [3.2K]

Answer: Length 132cm, Breadth 48cm

Explanation:

Perimeter = 360cm

Let the length and breadth be x

ATQ

2(11x + 4x) = 360

22x + 8x = 360

30x = 360

x = 360/30

x = 12

Length = 11×12

= 132 cm

Breadth = 4×12

= 48cm

Must click thanks and mark brainliest

6 0
3 years ago
Triangle A is transformed by the
Sauron [17]

Answer:

( -2.5 , 1 )

Step-by-step explanation:

(-2.5 ,1 ) hope this helps u

4 0
3 years ago
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