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3 years ago

When 27x^2z divided by -3x^2z^6 is correctly simplified, the exponent on the variable z is _____.

Mathematics

1 answer:

Dmitry_Shevchenko [17]3 years ago

6 0

The Answer Is YES :D

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In a recent study of 42 eighth graders, the mean number of hours per week that they watched television was 19.6. Assume the popu

olya-2409 [2.1K]

Answer:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

Step-by-step explanation:

Information given

$\bar X= 19.6$ represent the sample mean

$\mu$ population mean

$\sigma= 5.8$ represent the population deviation

n=42 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom, given by:

$df=n-1=42-1=41$

Since the Confidence is 0.98 or 98%, the significance would be $\alpha=0.02$ and $\alpha/2 =0.1$ , and the critical value would be $t_{\alpha/2}=2.42$

Replacing we got:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

8 0

3 years ago

Question:<br> 7x^2 + 8x = x^2

7nadin3 [17]

Answer:

x1= -4/3 and x2= 0

Step-by-step explanation:

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3 years ago

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If you can help press on this

GenaCL600 [577]

It is rational because any number that can be represented in a fraction is rational. 4/33 is a fraction, so it is rational.

8 0

3 years ago

A sandbag is released from a hot air balloon that is 400 ft above the ground. Using the falling object model, h = −16t^2 + s, wh

Bogdan [553]

Answer:

B. 5 seconds

Step-by-step explanation:

A graphing calculator shows the answer easily.

h(t) = 0 = -16t^2 +400

t = √(400/16) = 5

It will take 5 seconds for the sandbag to hit the ground.

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3 years ago

Here are the images:

nataly862011 [7]

Answer:

the anwer is D: all of the above

Step-by-step explanation:

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2 years ago

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