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3 years ago

13

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!! Simplify.

1 answer:

astraxan [27]3 years ago

4 0

The answer would be be B
~~~~~~~~~~~~~~~~~~~~~~~
You first factor out 54 and thats 3^2 * 6

(The factor of a # is what you multiply to get the answer)

You then do the same to x^9 and y ^7

After that you should have square root of [3^2 * 6x^8 * xy^6 * y]

When you combine this you will get 3x^4 y^3 sqre root [6xy]

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3 years ago

What is 10% of 1/4 please help and explain

makvit [3.9K]

10/100=0.1
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3 years ago

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The weights of 67 randomly selected axles were found to have a variance of 3.85. Construct the 80% confidence interval for the p

VLD [36.1K]

Answer:

$3.13$

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 67

Variance = 3.85

We have to find 80% confidence interval for the population variance of the weights.

Degree of freedom = 67 - 1 = 66

Level of significance = 0.2

Chi square critical value for lower tail =

$\chi^2_{1-\frac{\alpha}{2}}= 51.770$

Chi square critical value for upper tail =

$\chi^2_{\frac{\alpha}{2}}= 81.085$

80% confidence interval:

$\dfrac{(n-1)S^2}{\chi^2_{\frac{\alpha}{2}}} < \sigma^2 < \dfrac{(n-1)S^2}{\chi^2_{1-\frac{\alpha}{2}}}$

Putting values, we get,

$=\dfrac{(67-1)3.85}{81.085} < \sigma^2 < \dfrac{(67-1)3.85}{51.770}\\\\=3.13$

Thus, (3.13,4.91) is the required 80% confidence interval for the population variance of the weights.

8 0

3 years ago

Mr mehra spends 30% of his income in food 10% on charity 25% and is left with 15750 what is his salary? find his savings

nalin [4]

Answer:

Mr mehra's salary is 26250

Step-by-step explanation:

suppose,

Mr mehra's salary is x

so,

He spends in food = 30% of x

=(30/100) . x [x%=x/100]

= 30x/100

=3x/10

He spends in charity =10% of x

=10x/100

=x/10

Money left = 15750

so,

x = 3x/10 + x/10 + 15750

⇒x - 3x/10 - x/10 = 15750

⇒(10x-3x-x) /10 = 15750

⇒6x/10 = 15750

⇒6x=157500

⇒x = 157500/6

⇒x = 26250

∴Mr mehra's salary is 26250

5 0

3 years ago