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kompoz [17]
2 years ago
13

H + 52 72 ———- = —- 70. 56

Mathematics
1 answer:
oee [108]2 years ago
5 0

Answer:

h = 38

Step-by-step explanation:

\frac{h + 52}{70}  = \frac{9}{7}

h + 52 =  \frac{9}{7}  \times 70

h + 52 =  \frac{9 \times 70}{7}

h + 52 =  \frac{630}{7}

h + 52 = 90

h = 90 - 52

h = 38

the answer is 38.

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2 years ago
What information is necessary to prove the triangles congruent by SAS? ​
Ber [7]

Answer:

SAS requires two congruent sides and the included angle be also congruent

Given is the picture are congruent triangles

<u>ΔACB ≅ ΔECD, because:</u>

  • AC ≅ EC, given
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5 0
2 years ago
Read 2 more answers
In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the fol
Julli [10]

Answer:

0.071,1.928

Step-by-step explanation:

                                                Downtown Store   North Mall Store

Sample size   n                             25                        20

Sample mean \bar{x}                         $9                        $8

Sample standard deviation  s       $2                        $1

n_1=25\\n_2=20

\bar{x_1}=9\\ \bar{x_2}=8

s_1=2\\s_2=1

x_1-x_2=9-8=1

Standard error of difference of means = \sqrt{\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}}

Standard error of difference of means = \sqrt{\frac{2^2}{25}+\frac{1^2}{20}}

Standard error of difference of means = 0.458

Degree of freedom = \frac{\sqrt{(\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}})^2}{\frac{(\frac{s_1^2}{n_1})^2}{n_1-1}+\frac{(\frac{s_2^2}{n_2})^2}{n_2-1}}

Degree of freedom = \frac{\sqrt{(\frac{2^2}{25}+\frac{1^2}{20}})^2}{\frac{(\frac{2^2}{25})^2}{25-1}+\frac{(\frac{1^2}{20})^2}{20-1}}

Degree of freedom =36

So, z value at 95% confidence interval and 36 degree of freedom = 2.0280

Confidence interval = (x_1-x_2)-z \times SE(x_1-x_2),(x_1-x_2)+z \times SE(x_1-x_2)

Confidence interval = 1-(2.0280)\times 0.458,1+(2.0280)\times 0.458

Confidence interval = 0.071,1.928

Hence Option A is true

Confidence interval is  0.071,1.928

4 0
2 years ago
Find the area and perimeter of that triangle​
aleksandrvk [35]

Step-by-step explanation:

A = \frac{1}{2}(b*h)

A=\frac{1}{2} (14*5)

A=\frac{1}{2} (70)

<em>A = 35</em>

<em></em>P = s+s+s<em></em>

<em></em>P=12+14+6<em></em>

<em>P = 32</em>

6 0
2 years ago
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