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4 years ago

Is 21x9=9x21 identity

Mathematics

2 answers:

Ymorist [56]4 years ago

8 0

No, it is not because IDENTITY means itself, so the answer has to be the same.

laila [671]4 years ago

7 0

Nope because it has its own identy like you are your own pearson with your own identy so just think of it that way

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A researcher is interested in estimating the mean weight of a semi trailer truck to determine the potential load capacity. She t

Kaylis [27]

Answer: 95% confidence interval = 20,000 ± 2.12 $\times$ $\frac{1500}{\sqrt{17} }$

( 19228.736 , 20771.263 ) OR ( 19229 , 20771 )

Step-by-step explanation:

Given :

Sample size(n) = 17

Sample mean = 20000

Sample standard deviation = 1,500

5% confidence

∴ $\frac{\alpha}{2}$ = 0.025

Degree of freedom ( $d_{f}$ ) = n-1 = 16

∵ Critical value at ( 0.025 , 16 ) = 2.12

∴ 95% confidence interval = mean ± $Z_{c}$ $\times$ $\frac{\sigma}{\sqrt{n} }$

Critical value at 95% confidence interval = 20,000 ± 2.12 $\times$ $\frac{1500}{\sqrt{17} }$

( 19228.736 , 20771.263 ) OR ( 19229 , 20771 )

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4 years ago

The Model Is Made Out Of A Stack Plywood Sheets. Each Sheet Is 0.6 Inch Thick. How Many Sheets Of Plywood Tall Is The Model?

Naily [24]

Wat y'all must don't no what it is. what grade is y'all in but I need help in some of my stuff

5 0

3 years ago

Two straight lines VZ and YW intersect at X

Alexeev081 [22]

Answer:

∠WVX = 35°

Step-by-step explanation:

Look at the rough draw.

As you can see,

VW ║ YZ

So ∠XWV is congruent to ∠XYZ through alternate interior angle.

We can solve ∠WVX by considering the two other angles, 88° and 57°.

Total angle of a triangle is 180°.

So,

? + 88 + 57 = 180

? + 145 = 180

? = 180 - 145

? = 35°

5 0

4 years ago

Four times the quantity x plus two is equal to ten

Degger [83]

Answer: 4x+2=10

Step-by-step explanation:

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4 years ago

⚠WILL GET BRAINLEST...THE QUESTION IS AT THE BOTTOM ⚠How many solutions does have? O A. Two solutions B. No solutions C. Infinit

Keith_Richards [23]

Answer:

D one solution.

Step-by-step explanation:

It's linear. It is going to have at most 1 solution

8 + x/6 = x/6 - 4 + 5x/12 Subtract x/6 from both sides

8 = -4 + 5x/12 Add 4 to both sides

8+4 = 5x / 12 Combine

12 = 5x / 12 Multiply both sides by 12

12 * 12 = 5x * 12 / 12 Cancel

144 = 5x Divide by 5

144/5 = 5x/5

28.8 = x

3 0

3 years ago