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chubhunter [2.5K]

2 years ago

11

First to answer gets brainliest!

1 answer:

TEA [102]2 years ago

7 0

Answer:

it is the first one

Step-by-step explanation:

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A horse-drawn carriage travels 47 2/3 kilometers in 4 1/3 hours. At this rate, how many kilometers does it travel per hour? *Wil

nikitadnepr [17]

C. 11 2/3 kilometers

4 0

2 years ago

You have been assigned to determine whether more people prefer Coke or Pepsi. Assume that roughly half the population prefers Co

Alex Ar [27]

Answer:

$n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

Step-by-step explanation:

For this case we have the following info given:

$ME=0.03$ the margin of error desired

$Conf= 0.95$ the level of confidence given

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)

the critical value for 95% of confidence is $z=1.96$

We can use as estimator for the population of interest $\hat p=0.5$ . And on this case we have that $ME =\pm 0.03$ 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:

$n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

3 0

3 years ago

If a dice is rolled 18 times, how many times is the number 2 expected to come up? *

mart [117]

Answer:

the answer is B. 3 times

that's what I think

8 0

2 years ago

Select the correct answer.

Paladinen [302]

Answer:

D

Step-by-step explanation:

$2x^2+16x-8=0$

Simplify:

$x^2+8x=4$

Rewrite in the form $(x+a)^2=b$ :

$x^2+8x=4$

Add $4^2$ to both sides:

$x^2+8x+4^2=4+4^2$

$x^2+8x+4^2=20$

$\left(x+4\right)^2=20$

$x+4=\sqrt{20}$ or $x+4=-\sqrt{20}$

x = -4± $\sqrt{20}$

x= -4± $2\sqrt{5}$

8 0

2 years ago

Read 2 more answers

State a counterexample to the conjecture below if a number is divisible by 6 and 2 then there’s is divisible by 12

siniylev [52]

Any number that is divisible by 6 is already divisible by 2, but is not necessarily divisible by 12.

Counterexamples include: 6, 18, 30, 42, 54, and so on. You can find more by multiplying 6 by any odd number. However, multiplying 6 by an even number provides another "2" that would make it divisible by 12.

4 0

2 years ago

Read 2 more answers