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3 years ago

Help me out please!!!~

Mathematics

2 answers:

Ipatiy [6.2K]3 years ago

7 0

I’m pretty sure it’s the 3rd one

kicyunya [14]3 years ago

3 0

Answer:

y = - 3/10x + 1/2

Step-by-step explanation:

It's the 2nd one because it's <u>rise</u>

run

Since the slope is negative, you're going down 3, right 10. and the y -intercept AKA the starting point, is 1/2 because it's on the y line & well, that's where it starts.

Hope this helps you!! :)

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8+0=0+8 is what property

lubasha [3.4K]

Answer:

The property used is the commutative property.

Step-by-step explanation:

In the commutative property, the sum is the same if you reorder the numbers.

I hope this helped! :-)

5 0

3 years ago

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The proprietor of a boutique in New York wanted to determine the average age of his customers. A random sample of 25 customers r

jolli1 [7]

Answer:

$28-2.064\frac{10}{\sqrt{25}}=23.872$

$28+2.064\frac{10}{\sqrt{25}}=32.128$

So on this case the 95% confidence interval would be given by (23.9;32.1)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X=28$ represent the sample mean

$\mu$ population mean (variable of interest)

s=10 represent the sample standard deviation

n=25 represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=25-1=24$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,24)".And we see that $t_{\alpha/2}=2.064$

Now we have everything in order to replace into formula (1):

$28-2.064\frac{10}{\sqrt{25}}=23.872$

$28+2.064\frac{10}{\sqrt{25}}=32.128$

So on this case the 95% confidence interval would be given by (23.9;32.1)

7 0

3 years ago

I need help plz help me

denis-greek [22]

Answer: 2538

Step-by-step explanation:

12*21/2

126

126/1*41/2

2538

4 0

3 years ago

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Kate has a rectangular garden that is 8 feet long by 3 feet wide. She wishes to extend the length and width by the same amount i

elena55 [62]

<span>Let the extension of the length and width be x.
The new dimensions are: Length = 8+x
Width =3+x
Area = 104 ft squared
Area of a rectangle = Length x Width
Therefore,
(8+x)(3+x) = 104
x^2 +11x +24=104
x^2 +11x +24-104=0
x^2 +11x-80=0

Factorize using splitting the middle term method. X^2 +16x-5x-80=0 x(x+16)-5(x+16)=0 (x-5)(x+16)=0 either x-5 = 0 or x+16=0 x=5 or x=-16 length and width measure cannot be negative. Therefore, the extension of the length and width is 5 feet each.</span>

4 0

3 years ago

PLEASE HELP!!!

zhuklara [117]

Answer:

1 think 89

Step-by-step explanation:

3 0

3 years ago

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