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3 years ago

PLZ EXPLAIN AND U GET BRAILYEST AND 25 POINTS HALP ASAP PLZ

Mathematics

1 answer:

Ilia_Sergeevich [38]3 years ago

4 0

Answer

Step-by-step explanation:

14.95+14.95=29.90

19.95+19.95=39.90

39.90+29.90=69.80

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If fx) = 4х- 3 and g(x) = x+ 4, find (f-g)(x).<br> А. 7- 3x<br> В. 5x-7<br> C. 3x-7<br> D. 5x -1

kiruha [24]

Answer:

Step-by-step explanation:

(4x-3)-(x+4)

distribute the negative

(4x-3)+(-x-4)

add them together

3x-7

I hope this helps

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2 years ago

Find two consecutive whole numbers that lies between 134

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4 years ago

The town of Hayward (CA) has about 50,000 registered voters. A political research firm takes a simple random sample of 500 of th

Ilia_Sergeevich [38]

Answer:

(0.0757;0.1403)

Step-by-step explanation:

1) Data given and notation

Republicans =115

Democrats=331

Independents=54

Total= n= 115+331+54=500

$\hat p_{ind}=\frac{54}{500}=0.108$

Confidence=0.98=98%

2) Formula to use

The population proportion have the following distribution

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

The confidence interval for the population proportion is given by this formula

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p(1-\hat p)}{n}}$

We have the proportion of independents calculated

$\hat p_{ind}=\frac{54}{500}=0.108$

We can calculate $\alpha=1-conf=1-0.98=0.02$

And we can find $\alpha/2 =0.02/2=0.01$ , with this value we can find the critical value $z_{\alpha/2}$ using the normal distribution table, excel or a calculator.

On this case $z_{\alpha/2}=2.326$

3) Calculating the interval

And now we can calculate the interval:

$0.108 - 2.326\sqrt{\frac{0.108(1-0.108)}{500}}=0.0757$

$0.108 + 2.326\sqrt{\frac{0.108(1-0.108)}{500}}=0.1403$

So the 98% confidence interval for this case would be:

(0.0757;0.1403)

7 0

3 years ago