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3 years ago

What's the answer to (x+y+2) x (y+1)

Mathematics

1 answer:

svetoff [14.1K]3 years ago

6 0

By using the distributive property, (x+y+2)(y+1)=(x+y+2)y+(x+y+2)=xy+y^2+3y+x+2

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Joley is opening her first checking account as a teenager. She doesn't have a job, so most of the income will be presents from b

umka21 [38]

Answer:

the answer is A !

Step-by-step explanation:

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3 years ago

Help please with math geometry homework

Tanya [424]

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3 years ago

I don't understand this <br>

Brut [27]

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b=y-intercept (what y is when x is 0)

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3 years ago

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Bad White [126]

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3 years ago

The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day.

ozzi

Answer:

The 80% confidence interval for the mean usage of water is between 18.4 and 18.6 gallons per day.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.8}{2} = 0.1$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.1 = 0.90$ , so $z = 1.28$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.28*\frac{2.3}{\sqrt{717}} = 0.1$

The lower end of the interval is the sample mean subtracted by M. So it is 18.5 - 0.1 = 18.4 gallons per day.

The upper end of the interval is the sample mean added to M. So it is 18.5 + 0.1 = 18.6 gallons per day.

The 80% confidence interval for the mean usage of water is between 18.4 and 18.6 gallons per day.

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3 years ago