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3 years ago

X/5 - 7 =18 Solve equation

Mathematics

2 answers:

lukranit [14]3 years ago

4 0

Answer: x=5

Step-by-step explanation:

5 x 5 = 25 - 7 = 18

so x=5

Nuetrik [128]3 years ago

4 0

Answer: x = 125

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

x/5 - 7 = 18

1/5x + -7 = 18

Step 2: Add 7 to both sides.

1/5x - 7 + 7 = 18 + 7

1/5x = 25

Step 3: Multiply both sides by 5.

5 * (1/5x) = (5) * (25)

x = 125

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riadik2000 [5.3K]

Answer:

Step-by-step explanation:

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3 years ago

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

$n_1=25\\n_2=20$

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

$s_1=2\\s_2=1$

$x_1-x_2=9-8=1$

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

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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 $0.071,1.928$

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2 years ago

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2 years ago

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This is confusing I need help .

Fittoniya [83]

Answer:

x = 54
angle ACD = 124°

Step-by-step explanation:

The rule is that the exterior angle (ACD) is equal to the sum of the remote interior angles (the two marked angles on the right).

You are expected to use this relation to write and solve an equation.

exterior angle = angle D + angle B

(2x +16) = 58 + (x+12)

2x +16 = x +70

x + 16 = 70

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Then angle ACD is ...

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angle ACD = 124°

8 0

2 years ago

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ale4655 [162]

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3 years ago

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