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3 years ago

7

Jackson and his father are making a rectangular sand box. One side measures 5 1/2 feet and the other measures 4 1/2 feet. How ma

ny feet of materials do they need for the perimeter of the box?

2 answers:

slamgirl [31]3 years ago

3 0

20 feet because 5.5 times 2 is 11 and 4.5 times 2 is 9 so 11 plus 9 is 20. Hope this helps!

Oksana_A [137]3 years ago

3 0

The answer would be 9 1/4.

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The following random sample was selected from a normal distribution: 4.5, 6.4, 2.3, 1.8, 5.3, then the 95% confidence interval t

kap26 [50]

Answer:

the 95% confidence interval to estimate the population mean is between 1.62 and 6.50

Step-by-step explanation:

given data

distribution = 4.5, 6.4, 2.3, 1.8, 5.3

so n = 5

confidence interval = 95%

to find out

the population mean is between

solution

first we calculate the mean i.e.

mean = $\frac{1}{n}\sum_{i=1}^{n}x(i)$

mean = 4.5+ 6.4+ 2.3+ 1.8+ 5.3 / 5

mean = 4.06

now we calculate the standard deviation i.e.

standard deviation = $\sqrt{\frac{1}{n-1}\sum (x(i)-mean)^2}$

standard deviation = $\sqrt{\frac{1}{5-1}\sum (x(i)-mean)^2}$

standard deviation = $\sqrt{\frac{1}{5-1} (4.5-5)^2+(6.4-5)^2 +(2.3-5)^2+(1.8-5)^2+(5.3-5)^2}$

standard deviation = $\sqrt{\frac{1}{4} (4.5-5)^2+(6.4-5)^2 +(2.3-5)^2+(1.8-5)^2+(5.3-5)^2}$

standard deviation = 2.226544

so 95 % confidence interval is i.e. mean +/- t(5) * standard deviation/ $\sqrt{n}$

here t(5) will be 2.45

so

95 % confidence interval= 4.06 +/- 2.45 * 2.226 / $\sqrt{5}$

95 % confidence interval= 1.62 and 6.50

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3 years ago

Please I need answers for this!!

ANTONII [103]

Answer:

1. 8 bags

2 1 1/8

Step-by-step explanation:

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3 years ago

What is the solution to the system of equations y=x+3, y=3x+1

Snezhnost [94]

Substitution method

y = x + 3 (*)

y = 3x + 1 (**)

Substitute (*) to (**):

3x + 1 = x + 3 <em>subtract 1 from both sides</em>

3x = x + 2 <em>subtract x from both sides</em>

2x = 2 <em>divide both sides by 2</em>

<h3>x = 1</h3>

Put the value of x to (*):

y = 1 + 3

<h3>y = 4</h3><h3>Answer: x = 1 and y = 4 → (1, 4).</h3>

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4 years ago

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Cerrena [4.2K]

Answer:

First one: Function

Second one: not a function (a function cannot have two outputs)

Third one: Function

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Step-by-step explanation:

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3 years ago

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What would the total bill be of a lunch that costs 12.99 with a tax rate of 6%?

Kisachek [45]

Step-by-step explanation:

multiply 12.99 by 6% then add that to 12.99

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3 years ago

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