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3 years ago

5

A nonstop flight from Houston to Jacksonville takes x hours (travelling at 410 m/h). The return flight takes 30 minutes longer.

What is the distance from Houston to Jacksonville.

2 answers:

andriy [413]3 years ago

7 0

I do in fact believe that the answer to your question is the number 456

Nadusha1986 [10]3 years ago

4 0

Answer:

456 Miles

Step-by-step explanation:

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A company has two large computers. The slower computer can send all the company's email in 60 minutes. The faster computer can c

Lelu [443]

Answer:

If both computers are working together, it will take 24 minutes to do the job

Step-by-step explanation:

It is given that,

There are two computers.The slower computer can send all the company's email in 60 minutes.

The faster computer can complete the same job in 40 minutes

<u>To find the LCM of 40 and 60</u>

LCM (40, 60) = 120

<u>To find efficiency of 2 computers</u>

Let x be the efficiency of faster computer and y be the efficiency of faster computer

x = 120/40 = 3

y = 120/60 = 2

then, x + y = 3 + 2 = 5

Therefore efficiency of both the computer work together = x + y =5

<u>To find the time taken to work both the computer together</u>

time = 120/5 = 24 minutes

4 0

3 years ago

the volume of the a sphere whoes diameter is 18 cm is cubic cm . if it's diameter were reduced by half, it's volume would be of

FrozenT [24]

Answer:

The new volume is 8 times smaller than the original volume

Step-by-step explanation:

we know that

If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube

Let

z-----> the scale factor

x ----> the volume of the reduced sphere

y ----> the volume of the original sphere

so

$z^{3}=\frac{x}{y}$

we have

$z=1/2$ ----> scale factor

substitute

$(1/2)^{3}=\frac{x}{y}$

$(1/8)=\frac{x}{y}$

$x=\frac{y}{8}$

therefore

The new volume is 8 times smaller than the original volume

Verify

The volume of the original sphere is

$r=18/2=9\ cm$ ---> the radius is half the diameter

$V=\frac{4}{3}\pi (9)^{3}=972\pi \ cm^{3}$

the volume of the reduced sphere is

$r=9/2=4.5\ cm$ ---> the radius is half the diameter

$V=\frac{4}{3}\pi (4.5)^{3}=121.5\pi \ cm^{3}$

Divide the volumes

$972\pi \ cm^{3}/121.5\pi \ cm^{3}=8$

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3 years ago

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A 95% confidence interval for a population proportion was constructed using a sample proportion from a random sample. Which of t

liraira [26]

Answer:

All but last statement are correct.

Step-by-step explanation:

<em>If we were to use a 90% confidence level, the confidence interval from the same data would produce an interval wider than the 95% confidence interval.</em>

True. Confidence interval gets wider as the confidence level decreases.

<em>The sample proportion must lie in the 95% confidence interval. </em>

True. Confidence interval is constructed around sample mean.

<em>There is a 95% chance that the 95% confidence interval actually contains the population proportion.</em>

True. Constructing 95%. confidence interval for a population proportion using a sample proportion from a random sample means the same as the above statement.

<em>We don't know if the 95% confidence interval actually does or doesn't contain the population proportion</em>

True. There is 95% chance that confidence interval contains population proportion and 5% chance that it does not.

<em>The population proportion must lie in the 95% confidence interval</em>

False. There is 95% chance that population proportion lies in the confidence interval.

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3 years ago