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3 years ago

ASAP! GIVING BRAINLIEST! Please read the question THEN answer correctly! No guessing. Show your work or give an explaination.

Mathematics

1 answer:

Rom4ik [11]3 years ago

6 0

Answer:

X is 108, infinite

Step-by-step explanation:

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HELP WILL GIVE BRAINLIEST

Yuliya22 [10]

Answer:

Third option

Step-by-step explanation:

: ) Hope u will have a great day

8 0

3 years ago

30 POINTS LOOK BELOW TO ANSWER QUESTION WILL MARK BRAINLIEST

AlekseyPX

I think it is the second one. You did the lesson, what do you think? What is the reason you chose the third one?

5 0

4 years ago

An actor invested some money at 9% simple interest, and $42,000 more than three times the amount at 12%. The to

S_A_V [24]

<span>An actor invested some money at 9% simple interest, and $42,000 more than three times the amount at 12% per annum. </span><span>What we are after is amounts of interest invested at 9% and at 12%. Let's call them x and y respectively.

x=42000 at 9% = </span>$3,780.00 = $45,780.00
y=3x42000 at 12% = $15,120.00 = $141,120.00
x+y=$186,900.00

3 0

4 years ago

The polynomial function with rational coefficients has roots of: –2, √3, and - √3.

trapecia [35]

Answer:

= (x+2) (x- √3) ( x+√3)

Step-by-step explanation:

The polynomial has roots of -2 √3, and - √3.

The polynomial can be written as

f(x) = (x-a) (x-b) (x-c) where a b and c are the roots

f(x) = (x--2) (x- √3) ( x--√3)

= (x+2) (x- √3) ( x+√3)

8 0

4 years ago

In a college student poll, it is of interest to estimate the proportion p of students in favor of changing from a quarter-system

Contact [7]

Answer:

n=206

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".

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})$

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 99% of confidence, our significance level would be given by $\alpha=1-0.99=0.01$ and $\alpha/2 =0.005$ . And the critical value would be given by:

$t_{\alpha/2}=-2.58, t_{1-\alpha/2}=2.58$

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 $ME =\pm 0.09$ , we can use as prior estimate of p 0.5, since we don't have any other info provided, 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)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.09}{2.58})^2}=205.44$

And rounded up we have that n=206

3 0

3 years ago