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Yuki888 [10]
3 years ago
15

2(4 - d)= 3(2+d) How can you Find d?

Mathematics
2 answers:
lana66690 [7]3 years ago
7 0
2*4=8
2*d=2d
3*2=6
3*d=3d
Then collect like terms
8-2d=6+3d
2+5d
pashok25 [27]3 years ago
5 0
Distribute.

2(4-d)= 3(2+d)
8-2d= 6+3d

Add 2d to both sides.

8= 6+5d

Subtract 6 from both sides

2= 5d

Divide

d=2/5

You could also subtract 3d and add 8 Instead after distributing.
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three positive whole numbers have a sum of 48. The second number is 5 times the first and the third number is twice the second n
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Answer:

3, 15 and 30

Step-by-step explanation:

Let the first number be x

Second number is 5 times the first number = 5x

Third number is twice the second number = 2×5x = 10x

The equation becomes;

x + 5x + 10x = 48

16x = 48

x = 48 ÷ 16

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Therefore the three numbers are x = 3,  5x = 15 and 10x = 30

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Step-by-step explanation:

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During a 5​-year ​period, 35​% of snowstorms in a certain city caused power outages. Thirty dash nine of the snowstorms did not
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3 years ago
A survey conducted in July 2015 asked a random sample of American adults whether they had ever used online dating (either an onl
Natasha2012 [34]

Answer:

The 99% confidence interval is (0.0787, 0.1613).

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 interval 1-\alpha, we have the following confidence interval of proportions.

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

In which

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For this problem, we have that:

The survey included 411 adults between the ages of 55 and 64, and 50 of them said that they had used online dating. This means that n = 411, \pi = \frac{50}{411} = 0.12

The 99% confidence interval is

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.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{411}} = 0.12 - 2.575\sqrt{\frac{0.12*0.88}{411}} = 0.0787

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{411}} = 0.12 + 2.575\sqrt{\frac{0.12*0.88}{411}} = 0.1613

The 99% confidence interval is (0.0787, 0.1613).

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4 years ago
Which is the best estimate for the mass of a mouse?
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Mice are small and kilograms are for much larger objects. The other two measurements are for liquids. 
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