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Lilit [14]
3 years ago
10

How do you simplify this?

Mathematics
1 answer:
timama [110]3 years ago
4 0
Notice how the top is an addition of two cubes, namely x and 2.

You can rewrite the equation as:

\frac{x^{3} + 2^{3}}{x + 2}

Now, (a + b)³ can be simplified down to (a + b)(a² - ab + b²)
Following the same pattern, we get:

\frac{(x + 2)(x^{2} - 2x + 4)}{x + 2}
= x^{2} - 2x + 4
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Use a t-distribution to answer this question. Assume the samples are random samples from distributions that are reasonably norma
Nataliya [291]

Answer:

The degrees of freedom is 11.

The proportion in a t-distribution less than -1.4 is 0.095.

Step-by-step explanation:

The complete question is:

Use a t-distribution to answer this question. Assume the samples are random samples from distributions that are reasonably normally distributed, and that a t-statistic will be used for inference about the difference in sample means. State the degrees of freedom used. Find the proportion in a t-distribution less than -1.4  if the samples have sizes 1 = 12 and n 2 = 12 . Enter the exact answer for the degrees of freedom and round your answer for the area to three decimal places. degrees of freedom = Enter your answer; degrees of freedom proportion = Enter your answer; proportion

Solution:

The information provided is:

n_{1}=n_{2}=12\\t-stat=-1.4

Compute the degrees of freedom as follows:

\text{df}=\text{Min}.(n_{1}-1,\ n_{2}-1)

   =\text{Min}.(12-1,\ 12-1)\\\\=\text{Min}.(11,\ 11)\\\\=11

Thus, the degrees of freedom is 11.

Compute the proportion in a t-distribution less than -1.4 as follows:

P(t_{df}

                      =P(t_{11}>1.4)\\\\=0.095

*Use a <em>t</em>-table.

Thus, the proportion in a t-distribution less than -1.4 is 0.095.

8 0
3 years ago
Answer this question right and I will mark you brainliest
Alecsey [184]

Answer:

6 phones

Step-by-step explanation:

because there are 6 dots (representing phones) past the point 14.2 hrs

Hope this helps! :) if you have anymore questions like this id be willing to help you if you want.

8 0
3 years ago
I Need help again :)
Nookie1986 [14]
B it’s b I think I did same one
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