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3 years ago

Please help me i need help

Mathematics

2 answers:

Whitepunk [10]3 years ago

7 0

Answer:

-3

Step-by-step explanation:

Cube root of (-27) ...we find a number that multiplies itself 3 times...its most likely to be a negative

Hence (-3)^3 = -27

viva [34]3 years ago

3 0

Answer:

the answer u are looking for is negative 3

Step-by-step explanation:

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solve for the polynomial equation by factoring, then using the zero product principle. This is just the example problem Please e

Vaselesa [24]

Answer:

-3 comes from combining 1 and -4

Step-by-step explanation:

The -3 under the radical is the result of combining the terms

16 -4(16) = 16(1 -4) = 16(-3) = -3(16)

16 is factored out. It is done this way because 16 is a perfect square factor, so wants to maintain that identity while you figure out the rest of the radical.

$=\dfrac{-4\pm\sqrt{16-4(16)}}{2}=\dfrac{-4\pm\sqrt{16(1-4)}}{2}=\dfrac{-4\pm\sqrt{-3(16)}}{2}\\\\=\dfrac{-4\pm\sqrt{-3(4^2)}}{2}=\dfrac{-4\pm 4\sqrt{-3}}{2}=-2\pm2\sqrt{-3}=-2\pm2i\sqrt{3}$

8 0

3 years ago

Please Help!?

White raven [17]

number 48 looks correct

7 0

3 years ago

Read 2 more answers

6h^5+0h^4-12h^3+0h^3+0h=0

aliya0001 [1]

<h2>The value of h = 0, ± $\sqrt{2}$ </h2>

Step-by-step explanation:

We have,

$6h^5+0h^4-12h^3+0h^3+0h=0$

To find, the value of h = ?

∴ $6h^5+0h^4-12h^3+0h^3+0h=0$

⇒ $6h^5$ + (0) $h^4$ - 12 $h^3$ + (0) $h^3$ + (0)h = 0

⇒ $6h^5$ + 0 - 12 $h^3$ + 0 + 0 = 0

⇒ $6h^5$ - 12 $h^3$ = 0

Taking 6 $h^3$ as common, we get

$6h^3(h^2-2)$ = 0

⇒6 $h^3$ = 0 or, $h^2$ - 2 = 0

⇒ 6 $h^3$ = 0 ⇒ h = 0

⇒ $h^2$ = 2

⇒ h = ± $\sqrt{2}$

Hence, the value of h = 0, ± $\sqrt{2}$

7 0

3 years ago

Nitrates are groundwater contaminants derived from fertilizer, septic tank seepage and other sewage. Nitrate poisoning is partic

o-na [289]

Answer:

a) $n=\frac{0.5(1-0.5)}{(\frac{0.02}{1.96})^2}=2401$

And rounded up we have that n=2401

b) $n=\frac{0.07(1-0.07)}{(\frac{0.02}{1.96})^2}=625.22$

And rounded up we have that n=626

And we see that if we have previous info about p the sample size varies a lot.

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".

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

Part a

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

And on this case we have that $ME =\pm 0.02$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

Since we don't have prior information about the population proportion we can use ase estimator $\hat p =0.5$ . And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.02}{1.96})^2}=2401$

And rounded up we have that n=2401

Part b

For thi case the estimator for p is $\hat p =0.07$

$n=\frac{0.07(1-0.07)}{(\frac{0.02}{1.96})^2}=625.22$

And rounded up we have that n=626

And we see that if we have previous info about p the sample size varies a lot.

4 0

3 years ago

A furniture store is having a sale on sofas and you're going to buy one. The advertisers know that buyers get to the store and t

MrRissso [65]

Answer:

$290

Step-by-step explanation:

We are told that 1 out of 5 buyers change to a more expensive sofa than the one in the sale advertisement.

Now we are told that the advertised sofa is $250 and the more expensive sofa is $450.

Thus;

P(x) for expensive sofa = 1/5

P(x) for sofa in sale advertisement = 4/5

Thus, expected value is;

E(X) = (1/5)450 + (4/5)250

E(x) = 90 + 200

E(x) = $290

6 0

3 years ago