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3 years ago

Expand - 10 (b-9) Please do this quickly

Mathematics

1 answer:

adoni [48]3 years ago

4 0

Answer:

-10b + 90

Step-by-step explanation:

-10 (b- 9)

-10 ×( b -9 )

-10b + 90

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.y=x+2 y = 2x - 5 How do we solve this

otez555 [7]

Answer:

X=7

Y=9

Step-by-step explanation:

.y=x+2

y = 2x - 5

Use equivalents y=y so you get:

X+2=2x-5

X-2x=-5-2

-x=-7

X=7

Y=x+2=7+2=9

5 0

3 years ago

Read 2 more answers

To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19 randomly selected dowels and find

loris [4]

Answer:

Option D - $[0.12$

Step-by-step explanation:

Given : The manufacturer measures 19 randomly selected dowels and finds the standard deviation of the sample to be s=0.16.

To find : The 95% confidence interval for the population standard deviation sigma?

Solution :

Number of sample n=19

The degree of freedom is Df=n-1=19-1=18

The standard deviation of the sample is s=0.16

Applying chi-square table to find critical value,

Upper critical value of $\chi^2$ is $UC=\chi(\frac{0.05}{2},18) = 31.5264$

Lower critical value of $\chi^2$ is

$LC=\chi(1-\frac{0.05}{2},18) = 8.2307$

Lower limit of the 95% confidence interval for the population variance

$L=\frac{(df)\times (s^2)}{UC}$

$L=\frac{18\times (0.16^2)}{31.5264}$

$L=\frac{18\times0.0256}{31.5264}$

$L=\frac{0.4608}{31.5264}$

$L=0.0146$

Upper limit of the 95% confidence interval for the population variance

$U=\frac{(df)\times(s^2)}{LC}$

$U=\frac{18\times (0.16^2)}{8.2307}$

$U=\frac{18\times0.0256}{8.2307}$

$U=\frac{0.4608}{8.2307}$

$U=0.0559$

So, The 95% confidence interval for the population variance is [0.0146, 0.0560]

Now, The 95% confidence interval for the population standard deviation is

$[\sqrt{0.0146}$

$[0.1208$

or $[0.12$

Therefore, Option D is correct.

The 95% confidence interval for the population standard deviation is $[0.12$

6 0

2 years ago

Arnoldo needs to write this system in slope-intercept form. Which shows how he could do that? 3 x minus 2 y = 6. 0.4 (20 y + 15)

kotegsom [21]

Answer:

y = three-halves x minus 3

Step-by-step explanation:

Subtract 3x from both sides of the original equation.

-2y = -3x +6

Divide by -2

y = 3/2x -3

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3 years ago

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Brainliest guaranteed Explain how to estimate the length of an object

tino4ka555 [31]

Answer:

Step-by-step explanation:

for short lengths try your hand span.

for something a bit longer try using the length of your feet.

for something even longer try using your arm span or steps.

3 0

2 years ago

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Mr. Dorado has completed 75% of his morning run. Which of the following sets does not represent 75%?

Dovator [93]

Answer:

Step-by-step explanation:

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2 years ago

Expand - 10 (b-9) Please do this quickly ​

Expand - 10 (b-9) Please do this quickly