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2 years ago

Which graph represents f(x)=−2cos(4πx)?

Mathematics

1 answer:

algol [13]2 years ago

3 0

Answer:

the last one (bottom right)

Step-by-step explanation:

4×pi is the same as twice around the whole circle to the beginning. it is the same as 0°, and cos(0) = 1, and then -2×cos(0) = -2

so, we only need to look, where the function reaches -2.

it should be at x = 0, x = 0.5 and x = 1.

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Three runners, Dirk, Edith, and Foley all start at the same time for a $24$ km race, and each of them runs at a constant speed.

kompoz [17]

Answer:

$12$ km

Step-by-step explanation:

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4 0

2 years ago

Subtract. ( 2g + 6 ) – ( g+ 5 )

Sloan [31]

Answer:

g + 1

Step-by-step explanation:

(2g + 6) - (g + 5)

Distribute the negative

2g + 6 - g - 5

Combine like terms

2g - g + 6 - 5

g + 1

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3 years ago

) Beth wants to determine a 99 percent confidence interval for the true proportion p of high school students in the area who att

Lunna [17]

Answer:

n has to be at least 16577.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

Out of n randomly selected students she finds that that exactly half attend their home basketball games.

This means that $\pi = 0.5$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

About how large would n have to be to get a margin of error less than 0.01 for p

We have to find n for which M = 0.01. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.01 = 2.575\sqrt{\frac{0.5*0.5}{n}}$

$0.01\sqrt{n} = 2.575*0.5$

$\sqrt{n} = \frac{2.575*0.5}{0.01}$

$(\sqrt{n})^2 = (\frac{2.575*0.5}{0.01})^2$

$n = 16576.6$

Rounding up

n has to be at least 16577.

6 0

3 years ago

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Mama L [17]

Answer: Water molecules are attracted to each other due to hydrogen bonding.

Step-by-step explanation: Water molecules bind to the other water molecules surrounding it. The hydrogen bonds holding the molecules together results in water’s relatively high surface tension.

4 0

3 years ago

What is 19 hundredths of. 2,500

Neko [114]

The correct answer 475. All you have to do is multiply 2500 by 19/100. Hope this helps.

8 0

4 years ago

Read 2 more answers