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3 years ago

Pls help....................

Mathematics

1 answer:

PolarNik [594]3 years ago

6 0

$b^2+6b=0\\
b(b+6)=0\\
b=0 \vee b=-6\\\\
5x^2-5x=0\\
5x(x-1)=0\\
x=0 \vee x=1\\\\
-10x+35x=0\\
25x=0\\
x=0\\\\
2x+15x=0\\
17x=0\\
x=0\\\\
18x^2+6x=0\\
6x(3x+1)=0\\
x=0 \vee x=-\frac{1}{3}\\\\
-32x^2-24x=0\\
-8x(4x+3)=0\\
x=0 \vee x=-\frac{3}{4}$

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BigorU [14]

Answer: B) [-0.0332,0.1332]

Step-by-step explanation: Confidence Interval is an interval where we can be a percentage sure the true mean is.

The confidence interval for a difference in population proportion is calculated following these steps:

First, let's find population proportion for each population:

$p_{1}=\frac{30}{120}=0.25$

$p_{2}=\frac{32}{160}=0.2$

Second, calculate standard deviation for each proportion:

$\sigma_{1}=\sqrt{\frac{0.25(0.75)}{120} } = 0.0395$

$\sigma_{2}=\sqrt{\frac{0.2(0.8)}{160} } = 0.0316$

Now, we calculate standard error for difference:

$SE=\sqrt{\sigma_{1}^{2}+\sigma_{2}^{2}}$

$SE=\sqrt{0.0395^{2}+0.0316^{2}}$

SE = 0.0505

The z-score for a 90% CI is 1.645.

Then, confidence interval is

$p_{1}-p_{2}$ ± z-score.SE

$0.25-0.2$ ± $1.645(0.0505)$

0.05 ± 0.0831

The limits of this interval are:

inferior: 0.05 - 0.0831 = $-0.0332$

superior: 0.05 + 0.0831 = 0.1332

The 90% confidence interval for the difference in the population proportion of pit pulls and golden retrievers is $[-0.0332,0.1332]$ .

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3 years ago

Write 4.81 x 10^5 in standard form

tia_tia [17]

481,000
this is the answer because standered form is just asking to write the number out instead of notation

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4 years ago

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Drupady [299]

Answer:

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3 years ago

The circumference of a circle is 19.8mm. Find the length of the radius. Give your answer rounded to 1 DP.

Effectus [21]

Circumference of a circle = 2pie*r
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= 1980 = 628*r
r = 1980/628
r = 3.13
~= 3 cm^2
Hope it helped!!!”!!!
Comment below

3 0

4 years ago

Kofi estimated that he would run a total of 10 km in 1 h. In 1 h, he actually ran 46 times around a track 0.25 km long, going a

strojnjashka [21]

The equation to find percent error is

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where actual is the value that actually came out (in this case, 11.5 km) and theoretical is the value that was supposed to come out (in this case, 10 km). Just plug in the numbers and simplify.

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So, the true answer would be 15%. Apparently, the question you're asking takes 11.5 as the theoretical and the 10 as the actual (which I personally disagree with)

If you plugged in the numbers that way, the answer comes out to 13.04%. So, the correct answer for your answer choices is c. 13%

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3 years ago