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3 years ago

Please help

Mathematics

2 answers:

wolverine [178]3 years ago

4 0

Step-by-step explanation:

a is the correct not sure though

oee [108]3 years ago

3 0

Answer:Carlos will not close his account before $1,500 is present. Which of the

following intervals contains all the possible number of years after opening his

account that Carlos could close it?

Step-by-step explanation:

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Simplify square root of c^2d^6 / square root of 4c^3d^-4

charle [14.2K]

Answer: B on ed, i just took my test

Step-by-step explanation:

7 0

3 years ago

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

Look at this diagram:

vodka [1.7K]

Answer:

Angle e = Angle a
Angle f = Angle c
Angle a, b and c add upto 180° , as they are on straight line.
therefore Angle e , f and b also add upto 180°

i hope it helped 

7 0

3 years ago

The 5 starting players of the basketball team line up for the national anthem before the game. How many different ways can the p

densk [106]

5! ways= 120 ways. thats it.

7 0

3 years ago

What is the first step to solve the absolute value equation 2|x+5|=16 for x?????

Drupady [299]

Divide both sides by 2.

‌2(|x+5|)2‌=‌162
‌|x+5|=8

Solve Absolute Value.

|x+5|=8

We know eitherx+5=8 or x+5=−8

x+5=8 

x+5−5=8−5(Subtract 5 from both sides)

x=3

Answer:x=3‌‌

4 0

3 years ago