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3 years ago

7

the rectangles on a quilt are 2in. wide and 3in. long the perimeter of each rectangle is made by pattern of ref thread. if there

are 30 rectangles in the quilt, how much red thread is needed

1 answer:

maria [59]3 years ago

3 0

2(2)+2(3)=10 inches per rectangle, multiplied by 30 rectangles= 300 inches of red thread.

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Answer:

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Step-by-step explanation:

The circumference of a circle is $2\pir$ $\pi r$ , so $12\pi=2\pi r\\12=2r\\r=6$ . We can use this because the area of a circle is $\pi r^2$ . Thus, $\pi*6^2=36\pi$ .

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y = A(Bx - C)ⁿ + D

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3 years ago

A recent Gallup poll found that 36% of U.S. teens aged from 13 to 17 years old have a computer with [(6)] Internet access in the

In-s [12.5K]

Answer:

Step-by-step explanation:

a) The population parameter is the population proportion.

b) Confidence interval is written as

Sample proportion ± margin of error

Margin of error = z × √pq/n

Where

z represents the z score corresponding to the confidence level

p = sample proportion. It also means probability of success

q = probability of failure

q = 1 - p

p = x/n

Where

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x represents the number of success

From the information given,

n = 1028

p = 36/100 = 0.36

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α = 1 - 0.99 = 0.1

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1 - 0.05 = 0.995

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Therefore, the 99% confidence interval is

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The lower limit of the confidence interval is

0.36 - 0.039 = 0.321

The upper limit of the confidence interval is

0.36 + 0.039 = 0.399

Therefore, with 99% confidence interval, the proportion of U.S. teens aged from 13 to 17 years old that have a computer with Internet access in their rooms is between 0.321 and 0.399

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Square both sides

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Answer:

A

The correct option is B

B

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D

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