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3 years ago

Identify the common difference 10,20,30,40

Mathematics

2 answers:

leonid [27]3 years ago

7 0

Step-by-step explanation:

common different (d)

T1=10. T2=20

T2 - T1 =20 - 10

=10

Y_Kistochka [10]3 years ago

3 0

Answer: 10

Step-by-step explanation: 20-10=10, 30-20=10, 40-30=10.

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Zinaida [17]

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180 - 44 = 136
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3 years ago

Help me with this one please

Nataliya [291]

Answer:

Step-by-step explanation:

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3 years ago

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A survey of households in a small town showed that in 850 of 1,200 sampled households, at least one member attended a town meeti

Iteru [2.4K]

Answer:

Hence the confidence interval is ( 0.6745, 0.7422).

Step-by-step explanation:

Now the given are

Sample size = n = 1200

x = 850

Sample proportion is

$\hat{p}=\frac{x}{n}=\frac{850}{1200}=0.7083$

We have to construct 99% confidence interval for the population proportion.

Formula Used:

$(\hat{p}-E , \hat{p}+E)$

Here E is a margin of error.

$E =Zc\times\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$

Zc = 2.58

$E =2.58\times\sqrt{\frac{0.7083*(1-0.7083)}{1200}}\\\\E=2.58\times\sqrt{0.000172}=0.0339$

So confidence interval is ( 0.7083 - 0.0339 , 0.7083 + 0.0339)

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3 years ago

Solve the following equation for x to find the total number of people who became members of a social networking site for a certa

zavuch27 [327]

Answer:

360 people

Step-by-step explanation:

x = 0.8x + 72 Subtract 0.8x on both sides

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4 years ago

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At Furnace Woods School, enrollment increased from 320 students in 2006 to 349 students in 2007. What is the percent increase in

drek231 [11]

Answer:

9.0625%

Step-by-step explanation:

It increased from 320 to 349

This is a percent INCREASE.

320 is the "old" value and 349 is the "new" value.

We find percent increase by the formula:

$\frac{New-Old}{Old}*100$

Where old is 320 and new is 349. Lets substitute and find the increase (percentage):

$\frac{New-Old}{Old}*100\\=\frac{349-320}{320}*100\\=\frac{29}{320}*100\\=9.0625$

The percentage increase is 9.0625%

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3 years ago