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3 years ago

PLEASE HELP I NEED TO TURN THIS IN FAST

Mathematics

2 answers:

olga2289 [7]3 years ago

3 0

Answer:

you can do ittt

Step-by-step explanation:

i know you can

Zielflug [23.3K]3 years ago

3 0

Im sorry i cant help .
i need help myself

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Tion of your knowledge on the nature of roots:

MAXImum [283]

Answer:

The roots are not real.

Step-by-step explanation:

To prove : The roots of I/2 +9 (1-k) are real for all real values of k ?Solution :

The roots are real when discriminant is greater than equal to zero.

i.e b2-4ac>0 But the roots are imaginary therefore the roots of the given equation are not real for any value of k.If x²+kx+k=0, find the value of k, If the roots are real & equal.

3 0

3 years ago

Researchers are interested if a school breakfast program leads to taller children. Assume that the population of all 5 year-old

DedPeter [7]

Answer:

$39-1.96\frac{1}{\sqrt{25}}=38.608$

$39+1.96\frac{1}{\sqrt{25}}=39.392$

So on this case the 95% confidence interval would be given by (38.608;39.392)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X=39$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=1$ represent the population standard deviation

n=25 represent the sample size

Solution to the problem

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

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

The margin of error is given by:

$ME= z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-NORM.INV(0.025,0,1)".And we see that $z_{\alpha/2}=1.96$

And replacing we got:

$ME= 1.96 *\frac{1}{\sqrt{25}}= 0.392$

Now we have everything in order to replace into formula (1):

$39-1.96\frac{1}{\sqrt{25}}=38.608$

$39+1.96\frac{1}{\sqrt{25}}=39.392$

So on this case the 95% confidence interval would be given by (38.608;39.392)

7 0

3 years ago

Factor 6c^2 +13c +6<br><br>Please help!!!

Deffense [45]

Factor by grouping

(3c+2)(2c+3)

7 0

3 years ago

Mrquis ran 1/2 mile, Chad ran 7/8 mile, Jose ran 3/5 mile, and stephen ran 3/4 mile. Order them greatest to least

postnew [5]

Answer: Chad, Stephen, Jose and Mrquis

Step-by-step explanation:

We can change them to Percentage to make their ordering easier.

Mrquis ran 1/2 mile = 1/2 × 100 = 50%

Chad ran 7/8 mile = 7/8 × 100 = 87.5%

Jose ran 3/5 mile = 3/5 × 100 = 60%

Stephen ran 3/4 mile = 3/4 × 100 = 75%

Therefore, the ordering from the greatest to the least will be:

Chad, Stephen, Jose and Mrquis

8 0

3 years ago

What is the basic trigonometric identity you would use to verify that sec x sin x= tan x

mariarad [96]

secx=1/cosx

1. To solve this problem you must apply the following proccedure:

2. You have to verify if secx sinx=tanx, so, you have:

3. You know that secx=1/cosx, and tanx=sinx/cosx, therefore:

(secx)(sinx)

(1/cosx)(sinx)

sinx/cosx

tanx

3 0

3 years ago